252128261 has 16 divisors (see below), whose sum is σ = 320277888. Its totient is φ = 192753600.

The previous prime is 252128251. The next prime is 252128267. The reversal of 252128261 is 162821252.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252128261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252128267) 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, 26810 + ... + 34971.

It is an arithmetic number, because the mean of its divisors is an integer number (20017368).

Almost surely, 2^252128261 is an apocalyptic number.

It is an amenable number.

252128261 is a deficient number, since it is larger than the sum of its proper divisors (68149627).

252128261 is a wasteful number, since it uses less digits than its factorization.

252128261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61852.

The product of its digits is 3840, while the sum is 29.

The square root of 252128261 is about 15878.5471942492. The cubic root of 252128261 is about 631.7431033094.

The spelling of 252128261 in words is "two hundred fifty-two million, one hundred twenty-eight thousand, two hundred sixty-one".