125561996 has 48 divisors (see below), whose sum is σ = 261273600. Its totient is φ = 51659328.

The previous prime is 125561981. The next prime is 125561999. The reversal of 125561996 is 699165521.

It is not an unprimeable number, because it can be changed into a prime (125561999) 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 15 ways as a sum of consecutive naturals, for example, 193745 + ... + 194391.

It is an arithmetic number, because the mean of its divisors is an integer number (5443200).

Almost surely, 2^125561996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125561996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130636800).

125561996 is an abundant number, since it is smaller than the sum of its proper divisors (135711604).

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

125561996 is a wasteful number, since it uses less digits than its factorization.

125561996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 924 counting only the distinct ones).

The product of its digits is 145800, while the sum is 44.

The square root of 125561996 is about 11205.4449264632. Note that the first 3 decimals coincide. The cubic root of 125561996 is about 500.7482078117.

The spelling of 125561996 in words is "one hundred twenty-five million, five hundred sixty-one thousand, nine hundred ninety-six".