125721162 has 60 divisors (see below), whose sum is σ = 317885490. Its totient is φ = 35907984.

The previous prime is 125721149. The next prime is 125721173. The reversal of 125721162 is 261127521.

It can be written as a sum of positive squares in only one way, i.e., 85766121 + 39955041 = 9261^2 + 6321^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 41764 + ... + 44672.

Almost surely, 2^125721162 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125721162, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158942745).

125721162 is an abundant number, since it is smaller than the sum of its proper divisors (192164328).

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

125721162 is an equidigital number, since it uses as much as digits as its factorization.

125721162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945 (or 2921 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 125721162 is about 11212.5448494086. The cubic root of 125721162 is about 500.9597060832.

Adding to 125721162 its reverse (261127521), we get a palindrome (386848683).

The spelling of 125721162 in words is "one hundred twenty-five million, seven hundred twenty-one thousand, one hundred sixty-two".