91937493 has 6 divisors (see below), whose sum is σ = 132798614. Its totient is φ = 61291656.

The previous prime is 91937477. The next prime is 91937501. The reversal of 91937493 is 39473919.

It can be written as a sum of positive squares in only one way, i.e., 86545809 + 5391684 = 9303^2 + 2322^2 .

It is not a de Polignac number, because 91937493 - 2⁴ = 91937477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91937423) 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 in 5 ways as a sum of consecutive naturals, for example, 5107630 + ... + 5107647.

Almost surely, 2^91937493 is an apocalyptic number.

It is an amenable number.

91937493 is a deficient number, since it is larger than the sum of its proper divisors (40861121).

91937493 is a wasteful number, since it uses less digits than its factorization.

91937493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215283 (or 10215280 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 91937493 is about 9588.4040903583. The cubic root of 91937493 is about 451.3334816377. Note that the first 3 decimals are identical.

The spelling of 91937493 in words is "ninety-one million, nine hundred thirty-seven thousand, four hundred ninety-three".