1268937557 has 2 divisors, whose sum is σ = 1268937558. Its totient is φ = 1268937556.

The previous prime is 1268937547. The next prime is 1268937563. The reversal of 1268937557 is 7557398621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1085768401 + 183169156 = 32951^2 + 13534^2 .

It is an emirp because it is prime and its reverse (7557398621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268937557 - 2¹⁰ = 1268936533 is a prime.

It is a super-2 number, since 2×1268937557² = 3220405047130256498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1268937499 and 1268937508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268937517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634468778 + 634468779.

It is an arithmetic number, because the mean of its divisors is an integer number (634468779).

Almost surely, 2^1268937557 is an apocalyptic number.

It is an amenable number.

1268937557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268937557 is an equidigital number, since it uses as much as digits as its factorization.

1268937557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The square root of 1268937557 is about 35622.1498087917. The cubic root of 1268937557 is about 1082.6300659941.

The spelling of 1268937557 in words is "one billion, two hundred sixty-eight million, nine hundred thirty-seven thousand, five hundred fifty-seven".