1257516851 has 2 divisors, whose sum is σ = 1257516852. Its totient is φ = 1257516850.

The previous prime is 1257516839. The next prime is 1257516853. The reversal of 1257516851 is 1586157521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257516851 - 2⁶ = 1257516787 is a prime.

Together with 1257516853, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257516799 and 1257516808.

It is not a weakly prime, because it can be changed into another prime (1257516853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628758425 + 628758426.

It is an arithmetic number, because the mean of its divisors is an integer number (628758426).

Almost surely, 2^1257516851 is an apocalyptic number.

1257516851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257516851 is an equidigital number, since it uses as much as digits as its factorization.

1257516851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 41.

The square root of 1257516851 is about 35461.4840495995. The cubic root of 1257516851 is about 1079.3723064386.

The spelling of 1257516851 in words is "one billion, two hundred fifty-seven million, five hundred sixteen thousand, eight hundred fifty-one".