252215647 has 2 divisors, whose sum is σ = 252215648. Its totient is φ = 252215646.

The previous prime is 252215629. The next prime is 252215651. The reversal of 252215647 is 746512252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252215647 is a prime.

It is a super-2 number, since 2×252215647² = 127225465183257218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253215647) 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 as a sum of consecutive naturals, namely, 126107823 + 126107824.

It is an arithmetic number, because the mean of its divisors is an integer number (126107824).

Almost surely, 2^252215647 is an apocalyptic number.

252215647 is a deficient number, since it is larger than the sum of its proper divisors (1).

252215647 is an equidigital number, since it uses as much as digits as its factorization.

252215647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 34.

The square root of 252215647 is about 15881.2986559664. The cubic root of 252215647 is about 631.8160808829.

Adding to 252215647 its reverse (746512252), we get a palindrome (998727899).

The spelling of 252215647 in words is "two hundred fifty-two million, two hundred fifteen thousand, six hundred forty-seven".