31890678517 has 8 divisors (see below), whose sum is σ = 31941989280. Its totient is φ = 31839395280.

The previous prime is 31890678503. The next prime is 31890678563. The reversal of 31890678517 is 71587609813.

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 31890678517 - 2¹⁵ = 31890645749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31890678817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4271734 + ... + 4279192.

It is an arithmetic number, because the mean of its divisors is an integer number (3992748660).

Almost surely, 2^31890678517 is an apocalyptic number.

It is an amenable number.

31890678517 is a deficient number, since it is larger than the sum of its proper divisors (51310763).

31890678517 is an equidigital number, since it uses as much as digits as its factorization.

31890678517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13763.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 31890678517 in words is "thirty-one billion, eight hundred ninety million, six hundred seventy-eight thousand, five hundred seventeen".