63216431 has 4 divisors (see below), whose sum is σ = 63309672. Its totient is φ = 63123192.

The previous prime is 63216371. The next prime is 63216451. The reversal of 63216431 is 13461236.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63216431 - 2⁶ = 63216367 is a prime.

It is a super-2 number, since 2×63216431² = 7992634296755522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63216431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63216451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45596 + ... + 46961.

It is an arithmetic number, because the mean of its divisors is an integer number (15827418).

Almost surely, 2^63216431 is an apocalyptic number.

63216431 is a deficient number, since it is larger than the sum of its proper divisors (93241).

63216431 is an equidigital number, since it uses as much as digits as its factorization.

63216431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93240.

The product of its digits is 2592, while the sum is 26.

The square root of 63216431 is about 7950.8761152467. The cubic root of 63216431 is about 398.3608567822.

Adding to 63216431 its reverse (13461236), we get a palindrome (76677667).

The spelling of 63216431 in words is "sixty-three million, two hundred sixteen thousand, four hundred thirty-one".