91431283 has 2 divisors, whose sum is σ = 91431284. Its totient is φ = 91431282.

The previous prime is 91431257. The next prime is 91431289. The reversal of 91431283 is 38213419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91431283 - 2²⁵ = 57876851 is a prime.

It is a super-2 number, since 2×91431283² = 16719359022052178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91431289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715641 + 45715642.

It is an arithmetic number, because the mean of its divisors is an integer number (45715642).

Almost surely, 2^91431283 is an apocalyptic number.

91431283 is a deficient number, since it is larger than the sum of its proper divisors (1).

91431283 is an equidigital number, since it uses as much as digits as its factorization.

91431283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 91431283 is about 9561.9706650878. The cubic root of 91431283 is about 450.5036057399.

The spelling of 91431283 in words is "ninety-one million, four hundred thirty-one thousand, two hundred eighty-three".