252757621 has 2 divisors, whose sum is σ = 252757622. Its totient is φ = 252757620.

The previous prime is 252757613. The next prime is 252757633. The reversal of 252757621 is 126757252.

252757621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251222500 + 1535121 = 15850^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 252757621 - 2³ = 252757613 is a prime.

It is a super-3 number, since 3×252757621³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252757691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126378810 + 126378811.

It is an arithmetic number, because the mean of its divisors is an integer number (126378811).

Almost surely, 2^252757621 is an apocalyptic number.

It is an amenable number.

252757621 is a deficient number, since it is larger than the sum of its proper divisors (1).

252757621 is an equidigital number, since it uses as much as digits as its factorization.

252757621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 37.

The square root of 252757621 is about 15898.3527763099. The cubic root of 252757621 is about 632.2683167764.

It can be divided in two parts, 25275 and 7621, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 252757621 in words is "two hundred fifty-two million, seven hundred fifty-seven thousand, six hundred twenty-one".