1578961979 has 4 divisors (see below), whose sum is σ = 1804527984. Its totient is φ = 1353395976.

The previous prime is 1578961973. The next prime is 1578962017. The reversal of 1578961979 is 9791698751.

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 1578961979 - 2¹⁶ = 1578896443 is a prime.

It is a super-2 number, since 2×1578961979² = 4986241862255192882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1578961973) 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, 112782992 + ... + 112783005.

It is an arithmetic number, because the mean of its divisors is an integer number (451131996).

Almost surely, 2^1578961979 is an apocalyptic number.

1578961979 is a deficient number, since it is larger than the sum of its proper divisors (225566005).

1578961979 is an equidigital number, since it uses as much as digits as its factorization.

1578961979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225566004.

The product of its digits is 8573040, while the sum is 62.

The square root of 1578961979 is about 39736.1545572794. The cubic root of 1578961979 is about 1164.4581660085.

The spelling of 1578961979 in words is "one billion, five hundred seventy-eight million, nine hundred sixty-one thousand, nine hundred seventy-nine".