63861431 has 2 divisors, whose sum is σ = 63861432. Its totient is φ = 63861430.

The previous prime is 63861419. The next prime is 63861437. The reversal of 63861431 is 13416836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63861431 is a prime.

It is a super-2 number, since 2×63861431² = 8156564738735522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63861437) 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, 31930715 + 31930716.

It is an arithmetic number, because the mean of its divisors is an integer number (31930716).

Almost surely, 2^63861431 is an apocalyptic number.

63861431 is a deficient number, since it is larger than the sum of its proper divisors (1).

63861431 is an equidigital number, since it uses as much as digits as its factorization.

63861431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 63861431 is about 7991.3347445843. The cubic root of 63861431 is about 399.7111059842.

The spelling of 63861431 in words is "sixty-three million, eight hundred sixty-one thousand, four hundred thirty-one".