63431491 has 2 divisors, whose sum is σ = 63431492. Its totient is φ = 63431490.

The previous prime is 63431483. The next prime is 63431503. The reversal of 63431491 is 19413436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63431491 - 2³ = 63431483 is a prime.

It is not a weakly prime, because it can be changed into another prime (63431591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31715745 + 31715746.

It is an arithmetic number, because the mean of its divisors is an integer number (31715746).

Almost surely, 2^63431491 is an apocalyptic number.

63431491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63431491 is an equidigital number, since it uses as much as digits as its factorization.

63431491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 63431491 is about 7964.3889282229. The cubic root of 63431491 is about 398.8120818686.

The spelling of 63431491 in words is "sixty-three million, four hundred thirty-one thousand, four hundred ninety-one".