90149731 has 8 divisors (see below), whose sum is σ = 103102560. Its totient is φ = 77215488.

The previous prime is 90149729. The next prime is 90149749. The reversal of 90149731 is 13794109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90149731 - 2¹ = 90149729 is a prime.

It is a super-2 number, since 2×90149731² = 16253947998744722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90149831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8085 + ... + 15673.

It is an arithmetic number, because the mean of its divisors is an integer number (12887820).

Almost surely, 2^90149731 is an apocalyptic number.

90149731 is a deficient number, since it is larger than the sum of its proper divisors (12952829).

90149731 is a wasteful number, since it uses less digits than its factorization.

90149731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 90149731 is about 9494.7212176030. The cubic root of 90149731 is about 448.3888574133.

The spelling of 90149731 in words is "ninety million, one hundred forty-nine thousand, seven hundred thirty-one".