1251172122771 has 16 divisors (see below), whose sum is σ = 1786207399200. Its totient is φ = 776228395008.

The previous prime is 1251172122751. The next prime is 1251172122803. The reversal of 1251172122771 is 1772212711521.

It is a happy number.

It is not a de Polignac number, because 1251172122771 - 2³⁹ = 701416308883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251172122751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137820106 + ... + 137829183.

It is an arithmetic number, because the mean of its divisors is an integer number (111637962450).

Almost surely, 2^{1251172122771} is an apocalyptic number.

1251172122771 is a deficient number, since it is larger than the sum of its proper divisors (535035276429).

1251172122771 is a wasteful number, since it uses less digits than its factorization.

1251172122771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275649398.

The product of its digits is 27440, while the sum is 39.

The spelling of 1251172122771 in words is "one trillion, two hundred fifty-one billion, one hundred seventy-two million, one hundred twenty-two thousand, seven hundred seventy-one".