125931691 has 8 divisors (see below), whose sum is σ = 127057680. Its totient is φ = 124810752.

The previous prime is 125931661. The next prime is 125931713. The reversal of 125931691 is 196139521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125931691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125931691.

It is not an unprimeable number, because it can be changed into a prime (125931661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62191 + ... + 64183.

It is an arithmetic number, because the mean of its divisors is an integer number (15882210).

Almost surely, 2^125931691 is an apocalyptic number.

125931691 is a deficient number, since it is larger than the sum of its proper divisors (1125989).

125931691 is a wasteful number, since it uses less digits than its factorization.

125931691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525.

The product of its digits is 14580, while the sum is 37.

The square root of 125931691 is about 11221.9290231225. The cubic root of 125931691 is about 501.2391809905.

The spelling of 125931691 in words is "one hundred twenty-five million, nine hundred thirty-one thousand, six hundred ninety-one".