90631899 has 16 divisors (see below), whose sum is σ = 135331840. Its totient is φ = 59943240.

The previous prime is 90631897. The next prime is 90631903. The reversal of 90631899 is 99813609.

90631899 is a `hidden beast` number, since 9 + 0 + 631 + 8 + 9 + 9 = 666.

It is not a de Polignac number, because 90631899 - 2¹ = 90631897 is a prime.

It is a super-3 number, since 3×90631899³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90631897) 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, 9787 + ... + 16644.

It is an arithmetic number, because the mean of its divisors is an integer number (8458240).

Almost surely, 2^90631899 is an apocalyptic number.

90631899 is a deficient number, since it is larger than the sum of its proper divisors (44699941).

90631899 is a wasteful number, since it uses less digits than its factorization.

90631899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26567 (or 26561 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 90631899 is about 9520.0787286661. The cubic root of 90631899 is about 449.1868426074.

The spelling of 90631899 in words is "ninety million, six hundred thirty-one thousand, eight hundred ninety-nine".