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80512021 = 346923209
BaseRepresentation
bin1001100110010…
…00010000010101
312121111102201201
410303020100111
5131102341041
611553352501
71665224632
oct463102025
9177442651
1080512021
11414a0967
1222b68731
13138ac465
14a99b189
157105631
hex4cc8415

80512021 has 4 divisors (see below), whose sum is σ = 80538700. Its totient is φ = 80485344.

The previous prime is 80512013. The next prime is 80512027. The reversal of 80512021 is 12021508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25959025 + 54552996 = 5095^2 + 7386^2 .

It is a cyclic number.

It is not a de Polignac number, because 80512021 - 23 = 80512013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80512021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80512027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8136 + ... + 15073.

It is an arithmetic number, because the mean of its divisors is an integer number (20134675).

Almost surely, 280512021 is an apocalyptic number.

It is an amenable number.

80512021 is a deficient number, since it is larger than the sum of its proper divisors (26679).

80512021 is a wasteful number, since it uses less digits than its factorization.

80512021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26678.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 80512021 is about 8972.8491015953. The cubic root of 80512021 is about 431.8042469453.

Adding to 80512021 its reverse (12021508), we get a palindrome (92533529).

The spelling of 80512021 in words is "eighty million, five hundred twelve thousand, twenty-one".

Divisors: 1 3469 23209 80512021