91506431 has 2 divisors, whose sum is σ = 91506432. Its totient is φ = 91506430.

The previous prime is 91506419. The next prime is 91506469. The reversal of 91506431 is 13460519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91506431 - 2⁶ = 91506367 is a prime.

It is a super-2 number, since 2×91506431² = 16746853828715522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91506394 and 91506403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91506491) 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, 45753215 + 45753216.

It is an arithmetic number, because the mean of its divisors is an integer number (45753216).

Almost surely, 2^91506431 is an apocalyptic number.

91506431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91506431 is an equidigital number, since it uses as much as digits as its factorization.

91506431 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 91506431 is about 9565.8993827031. The cubic root of 91506431 is about 450.6269959444.

The spelling of 91506431 in words is "ninety-one million, five hundred six thousand, four hundred thirty-one".