63642251 has 2 divisors, whose sum is σ = 63642252. Its totient is φ = 63642250.

The previous prime is 63642247. The next prime is 63642259. The reversal of 63642251 is 15224636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63642251 - 2² = 63642247 is a prime.

It is a super-2 number, since 2×63642251² = 8100672224694002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63642259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821125 + 31821126.

It is an arithmetic number, because the mean of its divisors is an integer number (31821126).

Almost surely, 2^63642251 is an apocalyptic number.

63642251 is a deficient number, since it is larger than the sum of its proper divisors (1).

63642251 is an equidigital number, since it uses as much as digits as its factorization.

63642251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 63642251 is about 7977.6093536848. The cubic root of 63642251 is about 399.2532965355.

Adding to 63642251 its reverse (15224636), we get a palindrome (78866887).

The spelling of 63642251 in words is "sixty-three million, six hundred forty-two thousand, two hundred fifty-one".