31878408407 has 2 divisors, whose sum is σ = 31878408408. Its totient is φ = 31878408406.

The previous prime is 31878408389. The next prime is 31878408409. The reversal of 31878408407 is 70480487813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31878408407 - 2¹⁴ = 31878392023 is a prime.

Together with 31878408409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31878408409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15939204203 + 15939204204.

It is an arithmetic number, because the mean of its divisors is an integer number (15939204204).

Almost surely, 2^31878408407 is an apocalyptic number.

31878408407 is a deficient number, since it is larger than the sum of its proper divisors (1).

31878408407 is an equidigital number, since it uses as much as digits as its factorization.

31878408407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1204224, while the sum is 50.

The spelling of 31878408407 in words is "thirty-one billion, eight hundred seventy-eight million, four hundred eight thousand, four hundred seven".