90931799401 has 27 divisors (see below), whose sum is σ = 97988007351. Its totient is φ = 84370997808.

The previous prime is 90931799393. The next prime is 90931799423. The reversal of 90931799401 is 10499713909.

The square root of 90931799401 is 301549.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5982867801 + 84948931600 = 77349^2 + 291460^2 .

It is not a de Polignac number, because 90931799401 - 2³ = 90931799393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90931799461) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 338036295 + ... + 338036563.

Almost surely, 2^90931799401 is an apocalyptic number.

90931799401 is the 301549-th square number.

90931799401 is the 150775-th centered octagonal number.

It is an amenable number.

90931799401 is a deficient number, since it is larger than the sum of its proper divisors (7056207950).

90931799401 is an frugal number, since it uses more digits than its factorization.

90931799401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 52.

The spelling of 90931799401 in words is "ninety billion, nine hundred thirty-one million, seven hundred ninety-nine thousand, four hundred one".