1251561134951 has 2 divisors, whose sum is σ = 1251561134952. Its totient is φ = 1251561134950.

The previous prime is 1251561134843. The next prime is 1251561134963. The reversal of 1251561134951 is 1594311651521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251561134951 - 2¹⁴ = 1251561118567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251561134251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625780567475 + 625780567476.

It is an arithmetic number, because the mean of its divisors is an integer number (625780567476).

Almost surely, 2^{1251561134951} is an apocalyptic number.

1251561134951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251561134951 is an equidigital number, since it uses as much as digits as its factorization.

1251561134951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 44.

The spelling of 1251561134951 in words is "one trillion, two hundred fifty-one billion, five hundred sixty-one million, one hundred thirty-four thousand, nine hundred fifty-one".