125318989 has 4 divisors (see below), whose sum is σ = 125955324. Its totient is φ = 124682656.

The previous prime is 125318987. The next prime is 125319023. The reversal of 125318989 is 989813521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989813521 = 421 ⋅2351101.

It can be written as a sum of positive squares in 2 ways, for example, as 109558089 + 15760900 = 10467^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 125318989 - 2¹ = 125318987 is a prime.

It is a super-3 number, since 3×125318989³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125318981) 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, 317872 + ... + 318265.

It is an arithmetic number, because the mean of its divisors is an integer number (31488831).

Almost surely, 2^125318989 is an apocalyptic number.

It is an amenable number.

125318989 is a deficient number, since it is larger than the sum of its proper divisors (636335).

125318989 is an equidigital number, since it uses as much as digits as its factorization.

125318989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636334.

The product of its digits is 155520, while the sum is 46.

The square root of 125318989 is about 11194.5964197018. The cubic root of 125318989 is about 500.4249573868.

The spelling of 125318989 in words is "one hundred twenty-five million, three hundred eighteen thousand, nine hundred eighty-nine".