1251170551 has 2 divisors, whose sum is σ = 1251170552. Its totient is φ = 1251170550.

The previous prime is 1251170549. The next prime is 1251170587. The reversal of 1251170551 is 1550711521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251170551 - 2¹ = 1251170549 is a prime.

Together with 1251170549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251170051) 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, 625585275 + 625585276.

It is an arithmetic number, because the mean of its divisors is an integer number (625585276).

Almost surely, 2^1251170551 is an apocalyptic number.

1251170551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251170551 is an equidigital number, since it uses as much as digits as its factorization.

1251170551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 28.

The square root of 1251170551 is about 35371.8892766558. The cubic root of 1251170551 is about 1077.5534902019.

The spelling of 1251170551 in words is "one billion, two hundred fifty-one million, one hundred seventy thousand, five hundred fifty-one".