91790131 has 2 divisors, whose sum is σ = 91790132. Its totient is φ = 91790130.

The previous prime is 91790119. The next prime is 91790173. The reversal of 91790131 is 13109719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91790131 - 2²¹ = 89692979 is a prime.

It is a super-2 number, since 2×91790131² = 16850856297994322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91790093 and 91790102.

It is not a weakly prime, because it can be changed into another prime (91790731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45895065 + 45895066.

It is an arithmetic number, because the mean of its divisors is an integer number (45895066).

Almost surely, 2^91790131 is an apocalyptic number.

91790131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91790131 is an equidigital number, since it uses as much as digits as its factorization.

91790131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 91790131 is about 9580.7166224662. The cubic root of 91790131 is about 451.0922127462.

The spelling of 91790131 in words is "ninety-one million, seven hundred ninety thousand, one hundred thirty-one".