52491979 has 4 divisors (see below), whose sum is σ = 52839760. Its totient is φ = 52144200.

The previous prime is 52491973. The next prime is 52491983. The reversal of 52491979 is 97919425.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52491979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52491973) 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, 173664 + ... + 173965.

It is an arithmetic number, because the mean of its divisors is an integer number (13209940).

Almost surely, 2^52491979 is an apocalyptic number.

52491979 is a deficient number, since it is larger than the sum of its proper divisors (347781).

52491979 is a wasteful number, since it uses less digits than its factorization.

52491979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347780.

The product of its digits is 204120, while the sum is 46.

The square root of 52491979 is about 7245.1348503668. The cubic root of 52491979 is about 374.4245491054.

The spelling of 52491979 in words is "fifty-two million, four hundred ninety-one thousand, nine hundred seventy-nine".