15211504961 has 2 divisors, whose sum is σ = 15211504962. Its totient is φ = 15211504960.

The previous prime is 15211504951. The next prime is 15211504981. The reversal of 15211504961 is 16940511251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15207822400 + 3682561 = 123320^2 + 1919^2 .

It is a cyclic number.

It is not a de Polignac number, because 15211504961 - 2⁶ = 15211504897 is a prime.

It is a super-2 number, since 2×15211504961² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15211504921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7605752480 + 7605752481.

It is an arithmetic number, because the mean of its divisors is an integer number (7605752481).

Almost surely, 2^15211504961 is an apocalyptic number.

It is an amenable number.

15211504961 is a deficient number, since it is larger than the sum of its proper divisors (1).

15211504961 is an equidigital number, since it uses as much as digits as its factorization.

15211504961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 15211504961 in words is "fifteen billion, two hundred eleven million, five hundred four thousand, nine hundred sixty-one".