125513919 has 6 divisors (see below), whose sum is σ = 181297896. Its totient is φ = 83675940.

The previous prime is 125513893. The next prime is 125513929. The reversal of 125513919 is 919315521.

125513919 is a `hidden beast` number, since 12 + 551 + 3 + 91 + 9 = 666.

It is not a de Polignac number, because 125513919 - 2¹¹ = 125511871 is a prime.

It is a super-2 number, since 2×125513919² = 31507487725477122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125513929) 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, 6972987 + ... + 6973004.

It is an arithmetic number, because the mean of its divisors is an integer number (30216316).

Almost surely, 2^125513919 is an apocalyptic number.

125513919 is a deficient number, since it is larger than the sum of its proper divisors (55783977).

125513919 is a wasteful number, since it uses less digits than its factorization.

125513919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13945997 (or 13945994 counting only the distinct ones).

The product of its digits is 12150, while the sum is 36.

The square root of 125513919 is about 11203.2994693528. The cubic root of 125513919 is about 500.6842884049.

The spelling of 125513919 in words is "one hundred twenty-five million, five hundred thirteen thousand, nine hundred nineteen".