44991531 has 20 divisors (see below), whose sum is σ = 72381232. Its totient is φ = 27686448.

The previous prime is 44991521. The next prime is 44991539. The reversal of 44991531 is 13519944.

It is a happy number.

It is not a de Polignac number, because 44991531 - 2⁷ = 44991403 is a prime.

It is a super-2 number, since 2×44991531² = 4048475723447922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44991539) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20311 + ... + 22416.

Almost surely, 2^44991531 is an apocalyptic number.

44991531 is a deficient number, since it is larger than the sum of its proper divisors (27389701).

44991531 is a wasteful number, since it uses less digits than its factorization.

44991531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42752 (or 42743 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 44991531 is about 6707.5726608066. The cubic root of 44991531 is about 355.6670154717.

The spelling of 44991531 in words is "forty-four million, nine hundred ninety-one thousand, five hundred thirty-one".