10123931561 has 2 divisors, whose sum is σ = 10123931562. Its totient is φ = 10123931560.

The previous prime is 10123931549. The next prime is 10123931569. The reversal of 10123931561 is 16513932101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6124001536 + 3999930025 = 78256^2 + 63245^2 .

It is a cyclic number.

It is not a de Polignac number, because 10123931561 - 2¹⁸ = 10123669417 is a prime.

It is not a weakly prime, because it can be changed into another prime (10123931569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5061965780 + 5061965781.

It is an arithmetic number, because the mean of its divisors is an integer number (5061965781).

Almost surely, 2^10123931561 is an apocalyptic number.

It is an amenable number.

10123931561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10123931561 is an equidigital number, since it uses as much as digits as its factorization.

10123931561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The spelling of 10123931561 in words is "ten billion, one hundred twenty-three million, nine hundred thirty-one thousand, five hundred sixty-one".