91646131 has 2 divisors, whose sum is σ = 91646132. Its totient is φ = 91646130.

The previous prime is 91646129. The next prime is 91646141. The reversal of 91646131 is 13164619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91646131 - 2¹ = 91646129 is a prime.

It is a super-2 number, since 2×91646131² = 16798026654538322, which contains 22 as substring.

Together with 91646129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 91646093 and 91646102.

It is not a weakly prime, because it can be changed into another prime (91646141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45823065 + 45823066.

It is an arithmetic number, because the mean of its divisors is an integer number (45823066).

Almost surely, 2^91646131 is an apocalyptic number.

91646131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91646131 is an equidigital number, since it uses as much as digits as its factorization.

91646131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 91646131 is about 9573.1985772781. The cubic root of 91646131 is about 450.8561987151.

The spelling of 91646131 in words is "ninety-one million, six hundred forty-six thousand, one hundred thirty-one".