90391137 has 4 divisors (see below), whose sum is σ = 120521520. Its totient is φ = 60260756.

The previous prime is 90391123. The next prime is 90391153. The reversal of 90391137 is 73119309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73119309 = 3 ⋅24373103.

It is a cyclic number.

It is not a de Polignac number, because 90391137 - 2¹⁸ = 90128993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90391098 and 90391107.

It is not an unprimeable number, because it can be changed into a prime (90391157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15065187 + ... + 15065192.

It is an arithmetic number, because the mean of its divisors is an integer number (30130380).

Almost surely, 2^90391137 is an apocalyptic number.

It is an amenable number.

90391137 is a deficient number, since it is larger than the sum of its proper divisors (30130383).

90391137 is a wasteful number, since it uses less digits than its factorization.

90391137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30130382.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 90391137 is about 9507.4253612637. The cubic root of 90391137 is about 448.7887376392.

The spelling of 90391137 in words is "ninety million, three hundred ninety-one thousand, one hundred thirty-seven".