1979770913 has 4 divisors (see below), whose sum is σ = 2002015620. Its totient is φ = 1957526208.

The previous prime is 1979770907. The next prime is 1979771009. The reversal of 1979770913 is 3190779791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 650658064 + 1329112849 = 25508^2 + 36457^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979770913 - 2⁸ = 1979770657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979770213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11122220 + ... + 11122397.

It is an arithmetic number, because the mean of its divisors is an integer number (500503905).

Almost surely, 2^1979770913 is an apocalyptic number.

It is an amenable number.

1979770913 is a deficient number, since it is larger than the sum of its proper divisors (22244707).

1979770913 is an equidigital number, since it uses as much as digits as its factorization.

1979770913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22244706.

The product of its (nonzero) digits is 750141, while the sum is 53.

The square root of 1979770913 is about 44494.6166743798. The cubic root of 1979770913 is about 1255.6588051222.

The spelling of 1979770913 in words is "one billion, nine hundred seventy-nine million, seven hundred seventy thousand, nine hundred thirteen".