125519987 has 4 divisors (see below), whose sum is σ = 127032360. Its totient is φ = 124007616.

The previous prime is 125519981. The next prime is 125520007. The reversal of 125519987 is 789915521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789915521 = 5821 ⋅135701.

It is a cyclic number.

It is not a de Polignac number, because 125519987 - 2¹² = 125515891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125519981) 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, 756062 + ... + 756227.

It is an arithmetic number, because the mean of its divisors is an integer number (31758090).

Almost surely, 2^125519987 is an apocalyptic number.

125519987 is a deficient number, since it is larger than the sum of its proper divisors (1512373).

125519987 is an equidigital number, since it uses as much as digits as its factorization.

125519987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512372.

The product of its digits is 226800, while the sum is 47.

The square root of 125519987 is about 11203.5702791566. The cubic root of 125519987 is about 500.6923568415.

The spelling of 125519987 in words is "one hundred twenty-five million, five hundred nineteen thousand, nine hundred eighty-seven".