91324631 has 2 divisors, whose sum is σ = 91324632. Its totient is φ = 91324630.

The previous prime is 91324603. The next prime is 91324643. The reversal of 91324631 is 13642319.

It is a strong prime.

It is an emirp because it is prime and its reverse (13642319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91324631 is a prime.

It is a super-2 number, since 2×91324631² = 16680376454572322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91324594 and 91324603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91324031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45662315 + 45662316.

It is an arithmetic number, because the mean of its divisors is an integer number (45662316).

Almost surely, 2^91324631 is an apocalyptic number.

91324631 is a deficient number, since it is larger than the sum of its proper divisors (1).

91324631 is an equidigital number, since it uses as much as digits as its factorization.

91324631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 91324631 is about 9556.3921539460. The cubic root of 91324631 is about 450.3283710246.

The spelling of 91324631 in words is "ninety-one million, three hundred twenty-four thousand, six hundred thirty-one".