90156491 has 4 divisors (see below), whose sum is σ = 95459832. Its totient is φ = 84853152.

The previous prime is 90156487. The next prime is 90156497. The reversal of 90156491 is 19465109.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90156491 - 2² = 90156487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90156497) 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, 2651645 + ... + 2651678.

It is an arithmetic number, because the mean of its divisors is an integer number (23864958).

Almost surely, 2^90156491 is an apocalyptic number.

90156491 is a deficient number, since it is larger than the sum of its proper divisors (5303341).

90156491 is a wasteful number, since it uses less digits than its factorization.

90156491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303340.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 90156491 is about 9495.0771982117. The cubic root of 90156491 is about 448.4000648156.

The spelling of 90156491 in words is "ninety million, one hundred fifty-six thousand, four hundred ninety-one".