31440256671 has 8 divisors (see below), whose sum is σ = 44386244784. Its totient is φ = 19727219840.

The previous prime is 31440256667. The next prime is 31440256681. The reversal of 31440256671 is 17665204413.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31440256671 - 2² = 31440256667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440256621) 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 7 ways as a sum of consecutive naturals, for example, 308237760 + ... + 308237861.

It is an arithmetic number, because the mean of its divisors is an integer number (5548280598).

Almost surely, 2^31440256671 is an apocalyptic number.

31440256671 is a deficient number, since it is larger than the sum of its proper divisors (12945988113).

31440256671 is a wasteful number, since it uses less digits than its factorization.

31440256671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616475641.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 31440256671 in words is "thirty-one billion, four hundred forty million, two hundred fifty-six thousand, six hundred seventy-one".