45819721 has 4 divisors (see below), whose sum is σ = 45836032. Its totient is φ = 45803412.

The previous prime is 45819707. The next prime is 45819737. The reversal of 45819721 is 12791854.

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.

It is a cyclic number.

It is not a de Polignac number, because 45819721 - 2⁷ = 45819593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45819701) 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, 2745 + ... + 9958.

It is an arithmetic number, because the mean of its divisors is an integer number (11459008).

Almost surely, 2^45819721 is an apocalyptic number.

It is an amenable number.

45819721 is a deficient number, since it is larger than the sum of its proper divisors (16311).

45819721 is a wasteful number, since it uses less digits than its factorization.

45819721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16310.

The product of its digits is 20160, while the sum is 37.

The square root of 45819721 is about 6769.0265917634. The cubic root of 45819721 is about 357.8360958143.

The spelling of 45819721 in words is "forty-five million, eight hundred nineteen thousand, seven hundred twenty-one".