1597961779 has 2 divisors, whose sum is σ = 1597961780. Its totient is φ = 1597961778.

The previous prime is 1597961759. The next prime is 1597961797. The reversal of 1597961779 is 9771697951.

Together with next prime (1597961797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1597961779 - 2⁵ = 1597961747 is a prime.

It is a pancake number, because a pancake can be divided into 1597961779 parts by 56532 straight cuts.

It is not a weakly prime, because it can be changed into another prime (1597961759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798980889 + 798980890.

It is an arithmetic number, because the mean of its divisors is an integer number (798980890).

Almost surely, 2^1597961779 is an apocalyptic number.

1597961779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1597961779 is an equidigital number, since it uses as much as digits as its factorization.

1597961779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7501410, while the sum is 61.

The square root of 1597961779 is about 39974.5141183730. The cubic root of 1597961779 is about 1169.1102347139.

The spelling of 1597961779 in words is "one billion, five hundred ninety-seven million, nine hundred sixty-one thousand, seven hundred seventy-nine".