45131891 has 12 divisors (see below), whose sum is σ = 53620128. Its totient is φ = 37859472.

The previous prime is 45131839. The next prime is 45131893. The reversal of 45131891 is 19813154.

It is not a de Polignac number, because 45131891 - 2¹⁰ = 45130867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45131893) 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, 7496 + ... + 12101.

It is an arithmetic number, because the mean of its divisors is an integer number (4468344).

Almost surely, 2^45131891 is an apocalyptic number.

45131891 is a deficient number, since it is larger than the sum of its proper divisors (8488237).

45131891 is a wasteful number, since it uses less digits than its factorization.

45131891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19658 (or 19651 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 45131891 is about 6718.0273146215. The cubic root of 45131891 is about 356.0364894424.

The spelling of 45131891 in words is "forty-five million, one hundred thirty-one thousand, eight hundred ninety-one".