63642431 has 2 divisors, whose sum is σ = 63642432. Its totient is φ = 63642430.

The previous prime is 63642409. The next prime is 63642437. The reversal of 63642431 is 13424636.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63642431 is a prime.

It is a super-2 number, since 2×63642431² = 8100718047179522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 63642394 and 63642403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63642437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821215 + 31821216.

It is an arithmetic number, because the mean of its divisors is an integer number (31821216).

Almost surely, 2^63642431 is an apocalyptic number.

63642431 is a deficient number, since it is larger than the sum of its proper divisors (1).

63642431 is an equidigital number, since it uses as much as digits as its factorization.

63642431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 29.

The square root of 63642431 is about 7977.6206352521. The cubic root of 63642431 is about 399.2536729392.

The spelling of 63642431 in words is "sixty-three million, six hundred forty-two thousand, four hundred thirty-one".