31228646399 has 4 divisors (see below), whose sum is σ = 31298198400. Its totient is φ = 31159094400.

The previous prime is 31228646389. The next prime is 31228646401. The reversal of 31228646399 is 99364682213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31228646399 is a prime.

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 31228646399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31228646389) 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, 34775327 + ... + 34776224.

It is an arithmetic number, because the mean of its divisors is an integer number (7824549600).

Almost surely, 2^31228646399 is an apocalyptic number.

31228646399 is a deficient number, since it is larger than the sum of its proper divisors (69552001).

31228646399 is an equidigital number, since it uses as much as digits as its factorization.

31228646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69552000.

The product of its digits is 3359232, while the sum is 53.

The spelling of 31228646399 in words is "thirty-one billion, two hundred twenty-eight million, six hundred forty-six thousand, three hundred ninety-nine".