90213531 has 8 divisors (see below), whose sum is σ = 120405504. Its totient is φ = 60081960.

The previous prime is 90213481. The next prime is 90213533. The reversal of 90213531 is 13531209.

It is a happy number.

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

It is not a de Polignac number, because 90213531 - 2¹⁴ = 90197147 is a prime.

It is a super-2 number, since 2×90213531² = 16276962350975922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90213533) 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, 11491 + ... + 17676.

It is an arithmetic number, because the mean of its divisors is an integer number (15050688).

Almost surely, 2^90213531 is an apocalyptic number.

90213531 is a deficient number, since it is larger than the sum of its proper divisors (30191973).

90213531 is a wasteful number, since it uses less digits than its factorization.

90213531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30201.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 90213531 is about 9498.0803850041. The cubic root of 90213531 is about 448.4946091180.

The spelling of 90213531 in words is "ninety million, two hundred thirteen thousand, five hundred thirty-one".