31919399649 has 32 divisors (see below), whose sum is σ = 48583918080. Its totient is φ = 20696860800.

The previous prime is 31919399621. The next prime is 31919399651. The reversal of 31919399649 is 94699391913.

31919399649 is a `hidden beast` number, since 319 + 193 + 9 + 96 + 49 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-31919399649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31919399669) 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 31 ways as a sum of consecutive naturals, for example, 4262989 + ... + 4270469.

It is an arithmetic number, because the mean of its divisors is an integer number (1518247440).

Almost surely, 2^31919399649 is an apocalyptic number.

It is an amenable number.

31919399649 is a deficient number, since it is larger than the sum of its proper divisors (16664518431).

31919399649 is a wasteful number, since it uses less digits than its factorization.

31919399649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11798 (or 11792 counting only the distinct ones).

The product of its digits is 12754584, while the sum is 63.

The spelling of 31919399649 in words is "thirty-one billion, nine hundred nineteen million, three hundred ninety-nine thousand, six hundred forty-nine".