125731369 has 3 divisors (see below), whose sum is σ = 125742583. Its totient is φ = 125720156.

The previous prime is 125731357. The next prime is 125731427. The reversal of 125731369 is 963137521.

The square root of 125731369 is 11213.

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: 963137521 = 43 ⋅22398547.

It can be written as a sum of positive squares in only one way, i.e., 4995225 + 120736144 = 2235^2 + 10988^2 .

It is not a de Polignac number, because 125731369 - 2⁷ = 125731241 is a prime.

It is a super-2 number, since 2×125731369² = 31616754301228322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125731349) 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, 5607 + ... + 16819.

Almost surely, 2^125731369 is an apocalyptic number.

125731369 is the 11213-rd square number.

125731369 is the 5607-th centered octagonal number.

It is an amenable number.

125731369 is a deficient number, since it is larger than the sum of its proper divisors (11214).

125731369 is an frugal number, since it uses more digits than its factorization.

125731369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22426 (or 11213 counting only the distinct ones).

The product of its digits is 34020, while the sum is 37.

The cubic root of 125731369 is about 500.9732629559.

The spelling of 125731369 in words is "one hundred twenty-five million, seven hundred thirty-one thousand, three hundred sixty-nine".