126725121 has 16 divisors (see below), whose sum is σ = 190821120. Its totient is φ = 83097360.

The previous prime is 126725119. The next prime is 126725189. The reversal of 126725121 is 121527621.

It is not a de Polignac number, because 126725121 - 2¹ = 126725119 is a prime.

It is a super-3 number, since 3×126725121³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126725821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36825 + ... + 40118.

It is an arithmetic number, because the mean of its divisors is an integer number (11926320).

Almost surely, 2^126725121 is an apocalyptic number.

It is an amenable number.

126725121 is a deficient number, since it is larger than the sum of its proper divisors (64095999).

126725121 is an equidigital number, since it uses as much as digits as its factorization.

126725121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77013 (or 77007 counting only the distinct ones).

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

The square root of 126725121 is about 11257.2252797925. The cubic root of 126725121 is about 502.2896602404.

The spelling of 126725121 in words is "one hundred twenty-six million, seven hundred twenty-five thousand, one hundred twenty-one".