1251316511 has 2 divisors, whose sum is σ = 1251316512. Its totient is φ = 1251316510.

The previous prime is 1251316499. The next prime is 1251316513. The reversal of 1251316511 is 1156131521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251316511 - 2¹⁰ = 1251315487 is a prime.

Together with 1251316513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251316513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625658255 + 625658256.

It is an arithmetic number, because the mean of its divisors is an integer number (625658256).

Almost surely, 2^1251316511 is an apocalyptic number.

1251316511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251316511 is an equidigital number, since it uses as much as digits as its factorization.

1251316511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 26.

The square root of 1251316511 is about 35373.9524367860. The cubic root of 1251316511 is about 1077.5953905891.

The spelling of 1251316511 in words is "one billion, two hundred fifty-one million, three hundred sixteen thousand, five hundred eleven".