91924381 has 2 divisors, whose sum is σ = 91924382. Its totient is φ = 91924380.

The previous prime is 91924361. The next prime is 91924429. The reversal of 91924381 is 18342919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 416025 = 9566^2 + 645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91924381 is a prime.

It is a super-2 number, since 2×91924381² = 16900183644466322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91924381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91924351) 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, 45962190 + 45962191.

It is an arithmetic number, because the mean of its divisors is an integer number (45962191).

Almost surely, 2^91924381 is an apocalyptic number.

It is an amenable number.

91924381 is a deficient number, since it is larger than the sum of its proper divisors (1).

91924381 is an equidigital number, since it uses as much as digits as its factorization.

91924381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 91924381 is about 9587.7203234137. The cubic root of 91924381 is about 451.3120244289.

The spelling of 91924381 in words is "ninety-one million, nine hundred twenty-four thousand, three hundred eighty-one".