91542381 has 16 divisors (see below), whose sum is σ = 142896768. Its totient is φ = 51033600.

The previous prime is 91542377. The next prime is 91542389. The reversal of 91542381 is 18324519.

It is not a de Polignac number, because 91542381 - 2² = 91542377 is a prime.

It is a super-2 number, since 2×91542381² = 16760015038298322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91542389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52300 + ... + 54021.

It is an arithmetic number, because the mean of its divisors is an integer number (8931048).

Almost surely, 2^91542381 is an apocalyptic number.

It is an amenable number.

91542381 is a deficient number, since it is larger than the sum of its proper divisors (51354387).

91542381 is a wasteful number, since it uses less digits than its factorization.

91542381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106372.

The product of its digits is 8640, while the sum is 33.

The square root of 91542381 is about 9567.7782687518. The cubic root of 91542381 is about 450.6860006114.

The spelling of 91542381 in words is "ninety-one million, five hundred forty-two thousand, three hundred eighty-one".