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212730065 = 542546013
BaseRepresentation
bin11001010111000…
…00000011010001
3112211021210210022
430223200003101
5413424330230
633035313225
75162114162
oct1453400321
9484253708
10212730065
11aa098279
125b2ab815
13350c36a2
1420377769
1513a211e5
hexcae00d1

212730065 has 4 divisors (see below), whose sum is σ = 255276084. Its totient is φ = 170184048.

The previous prime is 212730053. The next prime is 212730101. The reversal of 212730065 is 560037212.

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 112169281 + 100560784 = 10591^2 + 10028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-212730065 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 21273002 + ... + 21273011.

It is an arithmetic number, because the mean of its divisors is an integer number (63819021).

Almost surely, 2212730065 is an apocalyptic number.

It is an amenable number.

212730065 is a deficient number, since it is larger than the sum of its proper divisors (42546019).

212730065 is an equidigital number, since it uses as much as digits as its factorization.

212730065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42546018.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 212730065 is about 14585.2687668071. The cubic root of 212730065 is about 596.9568741428.

Adding to 212730065 its reverse (560037212), we get a palindrome (772767277).

The spelling of 212730065 in words is "two hundred twelve million, seven hundred thirty thousand, sixty-five".

Divisors: 1 5 42546013 212730065