90000531531 has 12 divisors (see below), whose sum is σ = 133024042008. Its totient is φ = 58604997024.

The previous prime is 90000531527. The next prime is 90000531557. The reversal of 90000531531 is 13513500009.

It is not a de Polignac number, because 90000531531 - 2² = 90000531527 is a prime.

It is a super-2 number, since 2×90000531531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90000531495 and 90000531504.

It is not an unprimeable number, because it can be changed into a prime (90000531571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116279370 + ... + 116280143.

It is an arithmetic number, because the mean of its divisors is an integer number (11085336834).

Almost surely, 2^90000531531 is an apocalyptic number.

90000531531 is a deficient number, since it is larger than the sum of its proper divisors (43023510477).

90000531531 is a wasteful number, since it uses less digits than its factorization.

90000531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232559562 (or 232559559 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The spelling of 90000531531 in words is "ninety billion, five hundred thirty-one thousand, five hundred thirty-one".