91560431 has 2 divisors, whose sum is σ = 91560432. Its totient is φ = 91560430.

The previous prime is 91560409. The next prime is 91560433. The reversal of 91560431 is 13406519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91560431 - 2¹⁰ = 91559407 is a prime.

It is a super-2 number, since 2×91560431² = 16766625049811522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 91560433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91560394 and 91560403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91560433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45780215 + 45780216.

It is an arithmetic number, because the mean of its divisors is an integer number (45780216).

Almost surely, 2^91560431 is an apocalyptic number.

91560431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91560431 is an equidigital number, since it uses as much as digits as its factorization.

91560431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 91560431 is about 9568.7214924461. The cubic root of 91560431 is about 450.7156202172.

The spelling of 91560431 in words is "ninety-one million, five hundred sixty thousand, four hundred thirty-one".