252578621 has 2 divisors, whose sum is σ = 252578622. Its totient is φ = 252578620.

The previous prime is 252578593. The next prime is 252578633. The reversal of 252578621 is 126875252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246050596 + 6528025 = 15686^2 + 2555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252578621 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252508621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126289310 + 126289311.

It is an arithmetic number, because the mean of its divisors is an integer number (126289311).

Almost surely, 2^252578621 is an apocalyptic number.

It is an amenable number.

252578621 is a deficient number, since it is larger than the sum of its proper divisors (1).

252578621 is an equidigital number, since it uses as much as digits as its factorization.

252578621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 252578621 is about 15892.7222652383. The cubic root of 252578621 is about 632.1190265124.

The spelling of 252578621 in words is "two hundred fifty-two million, five hundred seventy-eight thousand, six hundred twenty-one".