125197581 has 4 divisors (see below), whose sum is σ = 166930112. Its totient is φ = 83465052.

The previous prime is 125197549. The next prime is 125197591. The reversal of 125197581 is 185791521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 125197581 - 2⁵ = 125197549 is a prime.

It is a super-2 number, since 2×125197581² = 31348868576503122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125197511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20866261 + ... + 20866266.

It is an arithmetic number, because the mean of its divisors is an integer number (41732528).

Almost surely, 2^125197581 is an apocalyptic number.

It is an amenable number.

125197581 is a deficient number, since it is larger than the sum of its proper divisors (41732531).

125197581 is an equidigital number, since it uses as much as digits as its factorization.

125197581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41732530.

The product of its digits is 25200, while the sum is 39.

The square root of 125197581 is about 11189.1724895097. The cubic root of 125197581 is about 500.2633026524.

It can be divided in two parts, 12519 and 7581, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 125197581 in words is "one hundred twenty-five million, one hundred ninety-seven thousand, five hundred eighty-one".