125651550 has 24 divisors (see below), whose sum is σ = 311616216. Its totient is φ = 33507040.

The previous prime is 125651549. The next prime is 125651557. The reversal of 125651550 is 55156521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125651557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418689 + ... + 418988.

It is an arithmetic number, because the mean of its divisors is an integer number (12984009).

Almost surely, 2^125651550 is an apocalyptic number.

125651550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125651550 is an abundant number, since it is smaller than the sum of its proper divisors (185964666).

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

125651550 is a wasteful number, since it uses less digits than its factorization.

125651550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837692 (or 837687 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 125651550 is about 11209.4402179591. The cubic root of 125651550 is about 500.8672282939.

The spelling of 125651550 in words is "one hundred twenty-five million, six hundred fifty-one thousand, five hundred fifty".