125251987 has 6 divisors (see below), whose sum is σ = 145701348. Its totient is φ = 107358804.

The previous prime is 125251981. The next prime is 125252003. The reversal of 125251987 is 789152521.

It is a de Polignac number, because none of the positive numbers 2^k-125251987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125251981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1278033 + ... + 1278130.

It is an arithmetic number, because the mean of its divisors is an integer number (24283558).

Almost surely, 2^125251987 is an apocalyptic number.

125251987 is a deficient number, since it is larger than the sum of its proper divisors (20449361).

125251987 is an equidigital number, since it uses as much as digits as its factorization.

125251987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556177 (or 2556170 counting only the distinct ones).

The product of its digits is 50400, while the sum is 40.

The square root of 125251987 is about 11191.6034150608. The cubic root of 125251987 is about 500.3357571505.

The spelling of 125251987 in words is "one hundred twenty-five million, two hundred fifty-one thousand, nine hundred eighty-seven".