252661397 has 2 divisors, whose sum is σ = 252661398. Its totient is φ = 252661396.

The previous prime is 252661391. The next prime is 252661399. The reversal of 252661397 is 793166252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211586116 + 41075281 = 14546^2 + 6409^2 .

It is a cyclic number.

It is not a de Polignac number, because 252661397 - 2¹⁸ = 252399253 is a prime.

Together with 252661399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252661391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126330698 + 126330699.

It is an arithmetic number, because the mean of its divisors is an integer number (126330699).

Almost surely, 2^252661397 is an apocalyptic number.

It is an amenable number.

252661397 is a deficient number, since it is larger than the sum of its proper divisors (1).

252661397 is an equidigital number, since it uses as much as digits as its factorization.

252661397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 252661397 is about 15895.3262627730. The cubic root of 252661397 is about 632.1880724322.

The spelling of 252661397 in words is "two hundred fifty-two million, six hundred sixty-one thousand, three hundred ninety-seven".