1254644171881 has 3 divisors (see below), whose sum is σ = 1254645291991. Its totient is φ = 1254643051772.

The previous prime is 1254644171867. The next prime is 1254644171909. The reversal of 1254644171881 is 1881714464521.

The square root of 1254644171881 is 1120109.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 938687761881 + 315956410000 = 968859^2 + 562100^2 .

It is not a de Polignac number, because 1254644171881 - 2³⁵ = 1220284433513 is a prime.

It is a super-2 number, since 2×1254644171881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1254644171821) 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 2 ways as a sum of consecutive naturals, for example, 560055 + ... + 1680163.

Almost surely, 2^{1254644171881} is an apocalyptic number.

1254644171881 is the 1120109-th square number.

1254644171881 is the 560055-th centered octagonal number.

It is an amenable number.

1254644171881 is a deficient number, since it is larger than the sum of its proper divisors (1120110).

1254644171881 is an frugal number, since it uses more digits than its factorization.

1254644171881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240218 (or 1120109 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 52.

The spelling of 1254644171881 in words is "one trillion, two hundred fifty-four billion, six hundred forty-four million, one hundred seventy-one thousand, eight hundred eighty-one".