1251375451 has 2 divisors, whose sum is σ = 1251375452. Its totient is φ = 1251375450.

The previous prime is 1251375449. The next prime is 1251375487. The reversal of 1251375451 is 1545731521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251375451 - 2¹ = 1251375449 is a prime.

Together with 1251375449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1251325451) 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, 625687725 + 625687726.

It is an arithmetic number, because the mean of its divisors is an integer number (625687726).

Almost surely, 2^1251375451 is an apocalyptic number.

1251375451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251375451 is an equidigital number, since it uses as much as digits as its factorization.

1251375451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 1251375451 is about 35374.7855258516. The cubic root of 1251375451 is about 1077.6123094301.

The spelling of 1251375451 in words is "one billion, two hundred fifty-one million, three hundred seventy-five thousand, four hundred fifty-one".