125251989 has 4 divisors (see below), whose sum is σ = 167002656. Its totient is φ = 83501324.

The previous prime is 125251981. The next prime is 125252003. The reversal of 125251989 is 989152521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125251989 - 2³ = 125251981 is a prime.

It is a super-2 number, since 2×125251989² = 31376121496912242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125251989.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 20875329 + ... + 20875334.

It is an arithmetic number, because the mean of its divisors is an integer number (41750664).

Almost surely, 2^125251989 is an apocalyptic number.

It is an amenable number.

125251989 is a deficient number, since it is larger than the sum of its proper divisors (41750667).

125251989 is an equidigital number, since it uses as much as digits as its factorization.

125251989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41750666.

The product of its digits is 64800, while the sum is 42.

The square root of 125251989 is about 11191.6035044135. The cubic root of 125251989 is about 500.3357598136.

The spelling of 125251989 in words is "one hundred twenty-five million, two hundred fifty-one thousand, nine hundred eighty-nine".