125521520 has 40 divisors (see below), whose sum is σ = 295546560. Its totient is φ = 49570560.

The previous prime is 125521519. The next prime is 125521547. The reversal of 125521520 is 25125521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×125521520² = 31511303966220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3611 + ... + 16250.

It is an arithmetic number, because the mean of its divisors is an integer number (7388664).

Almost surely, 2^125521520 is an apocalyptic number.

125521520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125521520 is an abundant number, since it is smaller than the sum of its proper divisors (170025040).

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

125521520 is a wasteful number, since it uses less digits than its factorization.

125521520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19953 (or 19947 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 125521520 is about 11203.6386946385. The cubic root of 125521520 is about 500.6943951842.

The spelling of 125521520 in words is "one hundred twenty-five million, five hundred twenty-one thousand, five hundred twenty".