125705556 has 18 divisors (see below), whose sum is σ = 317755802. Its totient is φ = 41901840.

The previous prime is 125705543. The next prime is 125705561. The reversal of 125705556 is 655507521.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69455556 + 56250000 = 8334^2 + 7500^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3491821 = 125705556 / (1 + 2 + 5 + 7 + 0 + 5 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 125705556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1745875 + ... + 1745946.

Almost surely, 2^125705556 is an apocalyptic number.

It is an amenable number.

125705556 is an abundant number, since it is smaller than the sum of its proper divisors (192050246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125705556 is a wasteful number, since it uses less digits than its factorization.

125705556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491831 (or 3491826 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The square root of 125705556 is about 11211.8489108621. The cubic root of 125705556 is about 500.9389768744.

The spelling of 125705556 in words is "one hundred twenty-five million, seven hundred five thousand, five hundred fifty-six".