63509431 has 2 divisors, whose sum is σ = 63509432. Its totient is φ = 63509430.

The previous prime is 63509401. The next prime is 63509477. The reversal of 63509431 is 13490536.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63509431 - 2²³ = 55120823 is a prime.

It is a super-2 number, since 2×63509431² = 8066895651887522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63509393 and 63509402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63509401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31754715 + 31754716.

It is an arithmetic number, because the mean of its divisors is an integer number (31754716).

Almost surely, 2^63509431 is an apocalyptic number.

63509431 is a deficient number, since it is larger than the sum of its proper divisors (1).

63509431 is an equidigital number, since it uses as much as digits as its factorization.

63509431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 63509431 is about 7969.2804568543. The cubic root of 63509431 is about 398.9753587670.

Adding to 63509431 its reverse (13490536), we get a palindrome (76999967).

The spelling of 63509431 in words is "sixty-three million, five hundred nine thousand, four hundred thirty-one".