90631901 has 4 divisors (see below), whose sum is σ = 90671904. Its totient is φ = 90591900.

The previous prime is 90631897. The next prime is 90631903. The reversal of 90631901 is 10913609.

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.

It is a cyclic number.

It is not a de Polignac number, because 90631901 - 2² = 90631897 is a prime.

It is a super-3 number, since 3×90631901³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90631903) 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, 16385 + ... + 21206.

It is an arithmetic number, because the mean of its divisors is an integer number (22667976).

Almost surely, 2^90631901 is an apocalyptic number.

It is an amenable number.

90631901 is a deficient number, since it is larger than the sum of its proper divisors (40003).

90631901 is a wasteful number, since it uses less digits than its factorization.

90631901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40002.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 90631901 is about 9520.0788337072. The cubic root of 90631901 is about 449.1868459115.

The spelling of 90631901 in words is "ninety million, six hundred thirty-one thousand, nine hundred one".