125221853689 has 3 divisors (see below), whose sum is σ = 125222207557. Its totient is φ = 125221499822.

The previous prime is 125221853671. The next prime is 125221853741. The reversal of 125221853689 is 986358122521.

The square root of 125221853689 is 353867.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986358122521 = 167 ⋅5906336063.

It is not a de Polignac number, because 125221853689 - 2⁵ = 125221853657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125221853089) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 176934 + ... + 530800.

Almost surely, 2^125221853689 is an apocalyptic number.

125221853689 is the 353867-th square number.

125221853689 is the 176934-th centered octagonal number.

It is an amenable number.

125221853689 is a deficient number, since it is larger than the sum of its proper divisors (353868).

125221853689 is an frugal number, since it uses more digits than its factorization.

125221853689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707734 (or 353867 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The spelling of 125221853689 in words is "one hundred twenty-five billion, two hundred twenty-one million, eight hundred fifty-three thousand, six hundred eighty-nine".