125516405 has 16 divisors (see below), whose sum is σ = 179622144. Its totient is φ = 82325760.

The previous prime is 125516387. The next prime is 125516429. The reversal of 125516405 is 504615521.

It is a happy number.

It is not a de Polignac number, because 125516405 - 2²² = 121322101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77156 + ... + 78765.

It is an arithmetic number, because the mean of its divisors is an integer number (11226384).

Almost surely, 2^125516405 is an apocalyptic number.

It is an amenable number.

125516405 is a deficient number, since it is larger than the sum of its proper divisors (54105739).

125516405 is a wasteful number, since it uses less digits than its factorization.

125516405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155956.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 125516405 is about 11203.4104182610. The cubic root of 125516405 is about 500.6875939955.

The spelling of 125516405 in words is "one hundred twenty-five million, five hundred sixteen thousand, four hundred five".