31380385647 has 16 divisors (see below), whose sum is σ = 46276828640. Its totient is φ = 18789086592.

The previous prime is 31380385633. The next prime is 31380385661. The reversal of 31380385647 is 74658308313.

It is an interprime number because it is at equal distance from previous prime (31380385633) and next prime (31380385661).

It is not a de Polignac number, because 31380385647 - 2⁶ = 31380385583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31380385596 and 31380385605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380385607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10871872 + ... + 10874757.

It is an arithmetic number, because the mean of its divisors is an integer number (2892301790).

Almost surely, 2^31380385647 is an apocalyptic number.

31380385647 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

31380385647 is a deficient number, since it is larger than the sum of its proper divisors (14896442993).

31380385647 is a wasteful number, since it uses less digits than its factorization.

31380385647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21746682.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 31380385647 in words is "thirty-one billion, three hundred eighty million, three hundred eighty-five thousand, six hundred forty-seven".