90015231 has 8 divisors (see below), whose sum is σ = 120233520. Its totient is φ = 59903552.

The previous prime is 90015203. The next prime is 90015241. The reversal of 90015231 is 13251009.

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

It is a cyclic number.

It is not a de Polignac number, because 90015231 - 2¹⁰ = 90014207 is a prime.

It is a super-2 number, since 2×90015231² = 16205483623966722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90015198 and 90015207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90015241) 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, 24660 + ... + 28073.

It is an arithmetic number, because the mean of its divisors is an integer number (15029190).

Almost surely, 2^90015231 is an apocalyptic number.

90015231 is a deficient number, since it is larger than the sum of its proper divisors (30218289).

90015231 is a wasteful number, since it uses less digits than its factorization.

90015231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53305.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 90015231 is about 9487.6356907293. The cubic root of 90015231 is about 448.1657533319.

The spelling of 90015231 in words is "ninety million, fifteen thousand, two hundred thirty-one".