125115691 has 4 divisors (see below), whose sum is σ = 125156584. Its totient is φ = 125074800.

The previous prime is 125115673. The next prime is 125115709. The reversal of 125115691 is 196511521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196511521 = 283 ⋅694387.

It is an interprime number because it is at equal distance from previous prime (125115673) and next prime (125115709).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125115691 is a prime.

It is a super-2 number, since 2×125115691² = 31307872268814962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125115671) 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, 15450 + ... + 22111.

It is an arithmetic number, because the mean of its divisors is an integer number (31289146).

Almost surely, 2^125115691 is an apocalyptic number.

125115691 is a deficient number, since it is larger than the sum of its proper divisors (40893).

125115691 is an equidigital number, since it uses as much as digits as its factorization.

125115691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40892.

The product of its digits is 2700, while the sum is 31.

The square root of 125115691 is about 11185.5125497225. The cubic root of 125115691 is about 500.1542071021.

The spelling of 125115691 in words is "one hundred twenty-five million, one hundred fifteen thousand, six hundred ninety-one".