13561931 has 2 divisors, whose sum is σ = 13561932. Its totient is φ = 13561930.

The previous prime is 13561901. The next prime is 13561963. The reversal of 13561931 is 13916531.

13561931 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13561931 - 2¹⁴ = 13545547 is a prime.

It is a super-2 number, since 2×13561931² = 367851944897522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13561894 and 13561903.

It is not a weakly prime, because it can be changed into another prime (13561901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780965 + 6780966.

It is an arithmetic number, because the mean of its divisors is an integer number (6780966).

Almost surely, 2^13561931 is an apocalyptic number.

13561931 is a deficient number, since it is larger than the sum of its proper divisors (1).

13561931 is an equidigital number, since it uses as much as digits as its factorization.

13561931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 13561931 is about 3682.6527123800. The cubic root of 13561931 is about 238.4737110758.

The spelling of 13561931 in words is "thirteen million, five hundred sixty-one thousand, nine hundred thirty-one".