45781979 has 4 divisors (see below), whose sum is σ = 45811584. Its totient is φ = 45752376.

The previous prime is 45781921. The next prime is 45781991. The reversal of 45781979 is 97918754.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97918754 = 2 ⋅48959377.

It is a cyclic number.

It is not a de Polignac number, because 45781979 - 2¹⁶ = 45716443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45781919) 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, 12347 + ... + 15620.

It is an arithmetic number, because the mean of its divisors is an integer number (11452896).

Almost surely, 2^45781979 is an apocalyptic number.

45781979 is a deficient number, since it is larger than the sum of its proper divisors (29605).

45781979 is a wasteful number, since it uses less digits than its factorization.

45781979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29604.

The product of its digits is 635040, while the sum is 50.

The square root of 45781979 is about 6766.2381719830. The cubic root of 45781979 is about 357.7378181913.

The spelling of 45781979 in words is "forty-five million, seven hundred eighty-one thousand, nine hundred seventy-nine".