90311631 has 4 divisors (see below), whose sum is σ = 120415512. Its totient is φ = 60207752.

The previous prime is 90311621. The next prime is 90311651. The reversal of 90311631 is 13611309.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90311631 - 2⁹ = 90311119 is a prime.

It is a super-2 number, since 2×90311631² = 16312381387760322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90311621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15051936 + ... + 15051941.

It is an arithmetic number, because the mean of its divisors is an integer number (30103878).

Almost surely, 2^90311631 is an apocalyptic number.

90311631 is a deficient number, since it is larger than the sum of its proper divisors (30103881).

90311631 is a wasteful number, since it uses less digits than its factorization.

90311631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30103880.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 90311631 is about 9503.2431832507. The cubic root of 90311631 is about 448.6571175668.

The spelling of 90311631 in words is "ninety million, three hundred eleven thousand, six hundred thirty-one".