45771991 has 4 divisors (see below), whose sum is σ = 45786400. Its totient is φ = 45757584.

The previous prime is 45771989. The next prime is 45772003. The reversal of 45771991 is 19917754.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 45771991 - 2¹ = 45771989 is a prime.

It is the 6766-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45771941) by changing a digit.

It is a nontrivial repunit in base 6765.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (11446600).

Almost surely, 2^45771991 is an apocalyptic number.

45771991 is a deficient number, since it is larger than the sum of its proper divisors (14409).

45771991 is an equidigital number, since it uses as much as digits as its factorization.

45771991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14408.

The product of its digits is 79380, while the sum is 43.

The square root of 45771991 is about 6765.5000554283. The cubic root of 45771991 is about 357.7118010751.

The spelling of 45771991 in words is "forty-five million, seven hundred seventy-one thousand, nine hundred ninety-one".