1979559791 has 24 divisors (see below), whose sum is σ = 2278935120. Its totient is φ = 1705017600.

The previous prime is 1979559773. The next prime is 1979559817.

1979559791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1979559791 - 2⁶ = 1979559727 is a prime.

It is a super-2 number, since 2×1979559791² = 7837313932287927362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979559191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 632711 + ... + 635831.

It is an arithmetic number, because the mean of its divisors is an integer number (94955630).

Almost surely, 2^1979559791 is an apocalyptic number.

1979559791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1979559791 is a deficient number, since it is larger than the sum of its proper divisors (299375329).

1979559791 is a wasteful number, since it uses less digits than its factorization.

1979559791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3264 counting only the distinct ones).

The product of its digits is 8037225, while the sum is 62.

The square root of 1979559791 is about 44492.2441668208. The cubic root of 1979559791 is about 1255.6141692134.

The spelling of 1979559791 in words is "one billion, nine hundred seventy-nine million, five hundred fifty-nine thousand, seven hundred ninety-one".