1267288157 has 2 divisors, whose sum is σ = 1267288158. Its totient is φ = 1267288156.

The previous prime is 1267288151. The next prime is 1267288189. The reversal of 1267288157 is 7518827621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815045401 + 452242756 = 28549^2 + 21266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267288157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267288151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633644078 + 633644079.

It is an arithmetic number, because the mean of its divisors is an integer number (633644079).

Almost surely, 2^1267288157 is an apocalyptic number.

It is an amenable number.

1267288157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267288157 is an equidigital number, since it uses as much as digits as its factorization.

1267288157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 47.

The square root of 1267288157 is about 35598.9909548010. The cubic root of 1267288157 is about 1082.1607851440.

The spelling of 1267288157 in words is "one billion, two hundred sixty-seven million, two hundred eighty-eight thousand, one hundred fifty-seven".