125411661 has 24 divisors (see below), whose sum is σ = 186895800. Its totient is φ = 80985600.

The previous prime is 125411653. The next prime is 125411681. The reversal of 125411661 is 166114521.

It can be written as a sum of positive squares in 4 ways, for example, as 396900 + 125014761 = 630^2 + 11181^2 .

It is not a de Polignac number, because 125411661 - 2³ = 125411653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125411641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53841 + ... + 56121.

It is an arithmetic number, because the mean of its divisors is an integer number (7787325).

Almost surely, 2^125411661 is an apocalyptic number.

It is an amenable number.

125411661 is a deficient number, since it is larger than the sum of its proper divisors (61484139).

125411661 is a wasteful number, since it uses less digits than its factorization.

125411661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477 (or 2474 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 125411661 is about 11198.7347946096. The cubic root of 125411661 is about 500.5482798919.

The spelling of 125411661 in words is "one hundred twenty-five million, four hundred eleven thousand, six hundred sixty-one".