127525721 has 4 divisors (see below), whose sum is σ = 135027252. Its totient is φ = 120024192.

The previous prime is 127525667. The next prime is 127525729.

127525721 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91393600 + 36132121 = 9560^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 127525721 - 2²⁶ = 60416857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (127525729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750740 + ... + 3750773.

It is an arithmetic number, because the mean of its divisors is an integer number (33756813).

Almost surely, 2^127525721 is an apocalyptic number.

It is an amenable number.

127525721 is a deficient number, since it is larger than the sum of its proper divisors (7501531).

127525721 is an equidigital number, since it uses as much as digits as its factorization.

127525721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7501530.

The product of its digits is 9800, while the sum is 32.

The square root of 127525721 is about 11292.7286782248. The cubic root of 127525721 is about 503.3451973969.

The spelling of 127525721 in words is "one hundred twenty-seven million, five hundred twenty-five thousand, seven hundred twenty-one".