90445531 has 8 divisors (see below), whose sum is σ = 100767744. Its totient is φ = 80473320.

The previous prime is 90445517. The next prime is 90445541. The reversal of 90445531 is 13554409.

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 90445531 - 2¹³ = 90437339 is a prime.

It is a super-2 number, since 2×90445531² = 16360788155743922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90445493 and 90445502.

It is not an unprimeable number, because it can be changed into a prime (90445541) 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, 86955 + ... + 87988.

It is an arithmetic number, because the mean of its divisors is an integer number (12595968).

Almost surely, 2^90445531 is an apocalyptic number.

90445531 is a deficient number, since it is larger than the sum of its proper divisors (10322213).

90445531 is a wasteful number, since it uses less digits than its factorization.

90445531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175001.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 90445531 is about 9510.2855372486. The cubic root of 90445531 is about 448.8787410047.

The spelling of 90445531 in words is "ninety million, four hundred forty-five thousand, five hundred thirty-one".