1979570657 has 2 divisors, whose sum is σ = 1979570658. Its totient is φ = 1979570656.

The previous prime is 1979570639. The next prime is 1979570683. The reversal of 1979570657 is 7560759791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1974113761 + 5456896 = 44431^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979570657 - 2¹⁰ = 1979569633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1979570057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989785328 + 989785329.

It is an arithmetic number, because the mean of its divisors is an integer number (989785329).

Almost surely, 2^1979570657 is an apocalyptic number.

It is an amenable number.

1979570657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979570657 is an equidigital number, since it uses as much as digits as its factorization.

1979570657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4167450, while the sum is 56.

The square root of 1979570657 is about 44492.3662778234. The cubic root of 1979570657 is about 1255.6164666061.

The spelling of 1979570657 in words is "one billion, nine hundred seventy-nine million, five hundred seventy thousand, six hundred fifty-seven".