125187917 has 4 divisors (see below), whose sum is σ = 126336540. Its totient is φ = 124039296.

The previous prime is 125187913. The next prime is 125187943. The reversal of 125187917 is 719781521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719781521 = 5077 ⋅141773.

It can be written as a sum of positive squares in 2 ways, for example, as 46936201 + 78251716 = 6851^2 + 8846^2 .

It is a cyclic number.

It is not a de Polignac number, because 125187917 - 2² = 125187913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125187913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574148 + ... + 574365.

It is an arithmetic number, because the mean of its divisors is an integer number (31584135).

Almost surely, 2^125187917 is an apocalyptic number.

It is an amenable number.

125187917 is a deficient number, since it is larger than the sum of its proper divisors (1148623).

125187917 is a wasteful number, since it uses less digits than its factorization.

125187917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148622.

The product of its digits is 35280, while the sum is 41.

The square root of 125187917 is about 11188.7406351206. The cubic root of 125187917 is about 500.2504305481.

The spelling of 125187917 in words is "one hundred twenty-five million, one hundred eighty-seven thousand, nine hundred seventeen".