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136736821 = 1310518217
BaseRepresentation
bin10000010011001…
…11000000110101
3100112021221122201
420021213000311
5240001034241
621322424501
73250146424
oct1011470065
9315257581
10136736821
1170203441
1239962131
1322436c80
14142352bb
15c00e931
hex8267035

136736821 has 4 divisors (see below), whose sum is σ = 147255052. Its totient is φ = 126218592.

The previous prime is 136736819. The next prime is 136736851. The reversal of 136736821 is 128637631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128637631 = 314149601.

It can be written as a sum of positive squares in 2 ways, for example, as 77616100 + 59120721 = 8810^2 + 7689^2 .

It is a cyclic number.

It is not a de Polignac number, because 136736821 - 21 = 136736819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136736801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5259096 + ... + 5259121.

It is an arithmetic number, because the mean of its divisors is an integer number (36813763).

Almost surely, 2136736821 is an apocalyptic number.

It is an amenable number.

136736821 is a deficient number, since it is larger than the sum of its proper divisors (10518231).

136736821 is a wasteful number, since it uses less digits than its factorization.

136736821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10518230.

The product of its digits is 36288, while the sum is 37.

The square root of 136736821 is about 11693.4520565999. The cubic root of 136736821 is about 515.1833588465.

The spelling of 136736821 in words is "one hundred thirty-six million, seven hundred thirty-six thousand, eight hundred twenty-one".

Divisors: 1 13 10518217 136736821