90571491 has 24 divisors (see below), whose sum is σ = 137938944. Its totient is φ = 57181680.

The previous prime is 90571489. The next prime is 90571513. The reversal of 90571491 is 19417509.

It is not a de Polignac number, because 90571491 - 2¹ = 90571489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90573491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9660 + ... + 16566.

It is an arithmetic number, because the mean of its divisors is an integer number (5747456).

Almost surely, 2^90571491 is an apocalyptic number.

90571491 is a deficient number, since it is larger than the sum of its proper divisors (47367453).

90571491 is a wasteful number, since it uses less digits than its factorization.

90571491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991 (or 6988 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 90571491 is about 9516.9055369905. The cubic root of 90571491 is about 449.0870230447.

The spelling of 90571491 in words is "ninety million, five hundred seventy-one thousand, four hundred ninety-one".