91977373 has 2 divisors, whose sum is σ = 91977374. Its totient is φ = 91977372.

The previous prime is 91977359. The next prime is 91977383. The reversal of 91977373 is 37377919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79887844 + 12089529 = 8938^2 + 3477^2 .

It is a cyclic number.

It is not a de Polignac number, because 91977373 - 2¹³ = 91969181 is a prime.

It is a super-2 number, since 2×91977373² = 16919674287962258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91977323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45988686 + 45988687.

It is an arithmetic number, because the mean of its divisors is an integer number (45988687).

Almost surely, 2^91977373 is an apocalyptic number.

It is an amenable number.

91977373 is a deficient number, since it is larger than the sum of its proper divisors (1).

91977373 is an equidigital number, since it uses as much as digits as its factorization.

91977373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250047, while the sum is 46.

The square root of 91977373 is about 9590.4834601807. The cubic root of 91977373 is about 451.3987309601.

The spelling of 91977373 in words is "ninety-one million, nine hundred seventy-seven thousand, three hundred seventy-three".