125515519 has 2 divisors, whose sum is σ = 125515520. Its totient is φ = 125515518.

The previous prime is 125515517. The next prime is 125515553. The reversal of 125515519 is 915515521.

It is a happy number.

It is an a-pointer prime, because the next prime (125515553) can be obtained adding 125515519 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125515519 - 2¹ = 125515517 is a prime.

It is a super-2 number, since 2×125515519² = 31508291019678722, which contains 22 as substring.

Together with 125515517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125515513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62757759 + 62757760.

It is an arithmetic number, because the mean of its divisors is an integer number (62757760).

Almost surely, 2^125515519 is an apocalyptic number.

125515519 is a deficient number, since it is larger than the sum of its proper divisors (1).

125515519 is an equidigital number, since it uses as much as digits as its factorization.

125515519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11250, while the sum is 34.

The square root of 125515519 is about 11203.3708766603. The cubic root of 125515519 is about 500.6864159019.

The spelling of 125515519 in words is "one hundred twenty-five million, five hundred fifteen thousand, five hundred nineteen".