125840691 has 12 divisors (see below), whose sum is σ = 181876968. Its totient is φ = 83844384.

The previous prime is 125840683. The next prime is 125840717. The reversal of 125840691 is 196048521.

125840691 is a `hidden beast` number, since 12 + 584 + 0 + 69 + 1 = 666.

It is not a de Polignac number, because 125840691 - 2³ = 125840683 is a prime.

It is a super-2 number, since 2×125840691² = 31671759022714962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125840641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18616 + ... + 24458.

It is an arithmetic number, because the mean of its divisors is an integer number (15156414).

Almost surely, 2^125840691 is an apocalyptic number.

125840691 is a deficient number, since it is larger than the sum of its proper divisors (56036277).

125840691 is a wasteful number, since it uses less digits than its factorization.

125840691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 125840691 is about 11217.8737290094. The cubic root of 125840691 is about 501.1184177515.

The spelling of 125840691 in words is "one hundred twenty-five million, eight hundred forty thousand, six hundred ninety-one".