90155252531 has 4 divisors (see below), whose sum is σ = 90498048432. Its totient is φ = 89812456632.

The previous prime is 90155252503. The next prime is 90155252549. The reversal of 90155252531 is 13525255109.

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 90155252531 - 2¹⁰ = 90155251507 is a prime.

It is a super-2 number, since 2×90155252531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90155251531) 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, 171397556 + ... + 171398081.

It is an arithmetic number, because the mean of its divisors is an integer number (22624512108).

Almost surely, 2^90155252531 is an apocalyptic number.

90155252531 is a deficient number, since it is larger than the sum of its proper divisors (342795901).

90155252531 is a wasteful number, since it uses less digits than its factorization.

90155252531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342795900.

The product of its (nonzero) digits is 67500, while the sum is 38.

The spelling of 90155252531 in words is "ninety billion, one hundred fifty-five million, two hundred fifty-two thousand, five hundred thirty-one".