1257511139 has 2 divisors, whose sum is σ = 1257511140. Its totient is φ = 1257511138.

The previous prime is 1257511127. The next prime is 1257511159. The reversal of 1257511139 is 9311157521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1257511139 - 2²⁰ = 1256462563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257511099 and 1257511108.

It is not a weakly prime, because it can be changed into another prime (1257511109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628755569 + 628755570.

It is an arithmetic number, because the mean of its divisors is an integer number (628755570).

Almost surely, 2^1257511139 is an apocalyptic number.

1257511139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257511139 is an equidigital number, since it uses as much as digits as its factorization.

1257511139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 35.

The square root of 1257511139 is about 35461.4035114235. The cubic root of 1257511139 is about 1079.3706721639.

The spelling of 1257511139 in words is "one billion, two hundred fifty-seven million, five hundred eleven thousand, one hundred thirty-nine".