1251172122751 has 2 divisors, whose sum is σ = 1251172122752. Its totient is φ = 1251172122750.

The previous prime is 1251172122691. The next prime is 1251172122803. The reversal of 1251172122751 is 1572212711521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251172122751 - 2¹³ = 1251172114559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251172122751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251172122451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625586061375 + 625586061376.

It is an arithmetic number, because the mean of its divisors is an integer number (625586061376).

Almost surely, 2^{1251172122751} is an apocalyptic number.

1251172122751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251172122751 is an equidigital number, since it uses as much as digits as its factorization.

1251172122751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 37.

The spelling of 1251172122751 in words is "one trillion, two hundred fifty-one billion, one hundred seventy-two million, one hundred twenty-two thousand, seven hundred fifty-one".