1251264851 has 2 divisors, whose sum is σ = 1251264852. Its totient is φ = 1251264850.

The previous prime is 1251264841. The next prime is 1251264857. The reversal of 1251264851 is 1584621521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251264851 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1251264857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625632425 + 625632426.

It is an arithmetic number, because the mean of its divisors is an integer number (625632426).

Almost surely, 2^1251264851 is an apocalyptic number.

1251264851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251264851 is an equidigital number, since it uses as much as digits as its factorization.

1251264851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

The square root of 1251264851 is about 35373.2222309475. Note that the first 4 decimals coincide. The cubic root of 1251264851 is about 1077.5805610493.

The spelling of 1251264851 in words is "one billion, two hundred fifty-one million, two hundred sixty-four thousand, eight hundred fifty-one".