45721979 has 4 divisors (see below), whose sum is σ = 45739584. Its totient is φ = 45704376.

The previous prime is 45721937. The next prime is 45721981. The reversal of 45721979 is 97912754.

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 45721979 - 2¹² = 45717883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45721919) 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, 4052 + ... + 10385.

It is an arithmetic number, because the mean of its divisors is an integer number (11434896).

Almost surely, 2^45721979 is an apocalyptic number.

45721979 is a deficient number, since it is larger than the sum of its proper divisors (17605).

45721979 is a wasteful number, since it uses less digits than its factorization.

45721979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17604.

The product of its digits is 158760, while the sum is 44.

The square root of 45721979 is about 6761.8029400449. The cubic root of 45721979 is about 357.5814709915.

The spelling of 45721979 in words is "forty-five million, seven hundred twenty-one thousand, nine hundred seventy-nine".