125500000 has 84 divisors (see below), whose sum is σ = 310074156. Its totient is φ = 50000000.

The previous prime is 125499989. The next prime is 125500061. The reversal of 125500000 is 5521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499875 + ... + 500125.

It is an arithmetic number, because the mean of its divisors is an integer number (3691359).

Almost surely, 2^125500000 is an apocalyptic number.

125500000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155037078).

125500000 is an abundant number, since it is smaller than the sum of its proper divisors (184574156).

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

125500000 is an frugal number, since it uses more digits than its factorization.

125500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 125500000 is about 11202.6782512040. The cubic root of 125500000 is about 500.6657797478.

Adding to 125500000 its reverse (5521), we get a palindrome (125505521).

The spelling of 125500000 in words is "one hundred twenty-five million, five hundred thousand".