45511531 has 12 divisors (see below), whose sum is σ = 49568112. Its totient is φ = 41766816.

The previous prime is 45511483. The next prime is 45511547. The reversal of 45511531 is 13511554.

It is a happy number.

It is not a de Polignac number, because 45511531 - 2⁹ = 45511019 is a prime.

It is a super-2 number, since 2×45511531² = 4142598907927922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45511496 and 45511505.

It is not an unprimeable number, because it can be changed into a prime (45511561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32610 + ... + 33976.

It is an arithmetic number, because the mean of its divisors is an integer number (4130676).

Almost surely, 2^45511531 is an apocalyptic number.

45511531 is a deficient number, since it is larger than the sum of its proper divisors (4056581).

45511531 is a wasteful number, since it uses less digits than its factorization.

45511531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1577 counting only the distinct ones).

The product of its digits is 1500, while the sum is 25.

The square root of 45511531 is about 6746.2234620564. The cubic root of 45511531 is about 357.0320047050.

The spelling of 45511531 in words is "forty-five million, five hundred eleven thousand, five hundred thirty-one".