90400432531 has 4 divisors (see below), whose sum is σ = 90565698952. Its totient is φ = 90235166112.

The previous prime is 90400432523. The next prime is 90400432541. The reversal of 90400432531 is 13523400409.

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 90400432531 - 2³ = 90400432523 is a prime.

It is a super-2 number, since 2×90400432531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90400432493 and 90400432502.

It is not an unprimeable number, because it can be changed into a prime (90400432541) 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, 82632390 + ... + 82633483.

It is an arithmetic number, because the mean of its divisors is an integer number (22641424738).

Almost surely, 2^90400432531 is an apocalyptic number.

90400432531 is a deficient number, since it is larger than the sum of its proper divisors (165266421).

90400432531 is a wasteful number, since it uses less digits than its factorization.

90400432531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165266420.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 90400432531 in words is "ninety billion, four hundred million, four hundred thirty-two thousand, five hundred thirty-one".