31355918449 has 4 divisors (see below), whose sum is σ = 31356580464. Its totient is φ = 31355256436.

The previous prime is 31355918401. The next prime is 31355918453. The reversal of 31355918449 is 94481955313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31355918449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31355918396 and 31355918405.

It is not an unprimeable number, because it can be changed into a prime (31355918749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253987 + ... + 356680.

It is an arithmetic number, because the mean of its divisors is an integer number (7839145116).

Almost surely, 2^31355918449 is an apocalyptic number.

It is an amenable number.

31355918449 is a deficient number, since it is larger than the sum of its proper divisors (662015).

31355918449 is an equidigital number, since it uses as much as digits as its factorization.

31355918449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662014.

The product of its digits is 2332800, while the sum is 52.

The spelling of 31355918449 in words is "thirty-one billion, three hundred fifty-five million, nine hundred eighteen thousand, four hundred forty-nine".