1979513797 has 2 divisors, whose sum is σ = 1979513798. Its totient is φ = 1979513796.

The previous prime is 1979513749. The next prime is 1979513807. The reversal of 1979513797 is 7973159791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1616763681 + 362750116 = 40209^2 + 19046^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979513797 - 2¹⁵ = 1979481029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1976513797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989756898 + 989756899.

It is an arithmetic number, because the mean of its divisors is an integer number (989756899).

Almost surely, 2^1979513797 is an apocalyptic number.

It is an amenable number.

1979513797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979513797 is an equidigital number, since it uses as much as digits as its factorization.

1979513797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750705, while the sum is 58.

The square root of 1979513797 is about 44491.7272872160. The cubic root of 1979513797 is about 1255.6044446329.

The spelling of 1979513797 in words is "one billion, nine hundred seventy-nine million, five hundred thirteen thousand, seven hundred ninety-seven".