252771509 has 2 divisors, whose sum is σ = 252771510. Its totient is φ = 252771508.

The previous prime is 252771473. The next prime is 252771527. The reversal of 252771509 is 905177252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235714609 + 17056900 = 15353^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 252771509 - 2²⁴ = 235994293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252771599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126385754 + 126385755.

It is an arithmetic number, because the mean of its divisors is an integer number (126385755).

Almost surely, 2^252771509 is an apocalyptic number.

It is an amenable number.

252771509 is a deficient number, since it is larger than the sum of its proper divisors (1).

252771509 is an equidigital number, since it uses as much as digits as its factorization.

252771509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 252771509 is about 15898.7895451195. The cubic root of 252771509 is about 632.2798967524.

The spelling of 252771509 in words is "two hundred fifty-two million, seven hundred seventy-one thousand, five hundred nine".