1247315557 has 2 divisors, whose sum is σ = 1247315558. Its totient is φ = 1247315556.

The previous prime is 1247315479. The next prime is 1247315561. The reversal of 1247315557 is 7555137421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 794732481 + 452583076 = 28191^2 + 21274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247315557 - 2⁷ = 1247315429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247315257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623657778 + 623657779.

It is an arithmetic number, because the mean of its divisors is an integer number (623657779).

Almost surely, 2^1247315557 is an apocalyptic number.

It is an amenable number.

1247315557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247315557 is an equidigital number, since it uses as much as digits as its factorization.

1247315557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147000, while the sum is 40.

The square root of 1247315557 is about 35317.3548981234. The cubic root of 1247315557 is about 1076.4456647272.

The spelling of 1247315557 in words is "one billion, two hundred forty-seven million, three hundred fifteen thousand, five hundred fifty-seven".