252101261 has 4 divisors (see below), whose sum is σ = 252183552. Its totient is φ = 252018972.

The previous prime is 252101249. The next prime is 252101281. The reversal of 252101261 is 162101252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 252101261 - 2¹⁰ = 252100237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252101281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36365 + ... + 42738.

It is an arithmetic number, because the mean of its divisors is an integer number (63045888).

Almost surely, 2^252101261 is an apocalyptic number.

It is an amenable number.

252101261 is a deficient number, since it is larger than the sum of its proper divisors (82291).

252101261 is an equidigital number, since it uses as much as digits as its factorization.

252101261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82290.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 252101261 is about 15877.6969677595. The cubic root of 252101261 is about 631.7205517284.

Subtracting from 252101261 its reverse (162101252), we obtain a palindrome (90000009).

The spelling of 252101261 in words is "two hundred fifty-two million, one hundred one thousand, two hundred sixty-one".