1268812157 has 2 divisors, whose sum is σ = 1268812158. Its totient is φ = 1268812156.

The previous prime is 1268812091. The next prime is 1268812163. The reversal of 1268812157 is 7512188621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245666436 + 23145721 = 35294^2 + 4811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268812157 - 2¹² = 1268808061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268812057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634406078 + 634406079.

It is an arithmetic number, because the mean of its divisors is an integer number (634406079).

Almost surely, 2^1268812157 is an apocalyptic number.

It is an amenable number.

1268812157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268812157 is an equidigital number, since it uses as much as digits as its factorization.

1268812157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 41.

The square root of 1268812157 is about 35620.3896244833. The cubic root of 1268812157 is about 1082.5944019637.

The spelling of 1268812157 in words is "one billion, two hundred sixty-eight million, eight hundred twelve thousand, one hundred fifty-seven".