45391979 has 4 divisors (see below), whose sum is σ = 45718680. Its totient is φ = 45065280.

The previous prime is 45391963. The next prime is 45391981. The reversal of 45391979 is 97919354.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45391979 - 2⁴ = 45391963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45391909) 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, 163142 + ... + 163419.

It is an arithmetic number, because the mean of its divisors is an integer number (11429670).

Almost surely, 2^45391979 is an apocalyptic number.

45391979 is a deficient number, since it is larger than the sum of its proper divisors (326701).

45391979 is a wasteful number, since it uses less digits than its factorization.

45391979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326700.

The product of its digits is 306180, while the sum is 47.

The square root of 45391979 is about 6737.3569743632. The cubic root of 45391979 is about 356.7191073018.

The spelling of 45391979 in words is "forty-five million, three hundred ninety-one thousand, nine hundred seventy-nine".