45631537 has 4 divisors (see below), whose sum is σ = 52150336. Its totient is φ = 39112740.

The previous prime is 45631507. The next prime is 45631543. The reversal of 45631537 is 73513654.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73513654 = 2 ⋅36756827.

It is a cyclic number.

It is not a de Polignac number, because 45631537 - 2⁷ = 45631409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45631507) 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, 3259389 + ... + 3259402.

It is an arithmetic number, because the mean of its divisors is an integer number (13037584).

Almost surely, 2^45631537 is an apocalyptic number.

It is an amenable number.

45631537 is a deficient number, since it is larger than the sum of its proper divisors (6518799).

45631537 is an equidigital number, since it uses as much as digits as its factorization.

45631537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6518798.

The product of its digits is 37800, while the sum is 34.

The square root of 45631537 is about 6755.1119161713. Note that the first 3 decimals coincide. The cubic root of 45631537 is about 357.3455397422.

The spelling of 45631537 in words is "forty-five million, six hundred thirty-one thousand, five hundred thirty-seven".