90139971 has 32 divisors (see below), whose sum is σ = 131891200. Its totient is φ = 54548640.

The previous prime is 90139969. The next prime is 90139979. The reversal of 90139971 is 17993109.

It is not a de Polignac number, because 90139971 - 2¹ = 90139969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90139979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245430 + ... + 245796.

It is an arithmetic number, because the mean of its divisors is an integer number (4121600).

Almost surely, 2^90139971 is an apocalyptic number.

90139971 is a deficient number, since it is larger than the sum of its proper divisors (41751229).

90139971 is a wasteful number, since it uses less digits than its factorization.

90139971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 90139971 is about 9494.2072338874. The cubic root of 90139971 is about 448.3726753233.

The spelling of 90139971 in words is "ninety million, one hundred thirty-nine thousand, nine hundred seventy-one".