31868778417 has 12 divisors (see below), whose sum is σ = 49429125936. Its totient is φ = 18210730440.

The previous prime is 31868778377. The next prime is 31868778421. The reversal of 31868778417 is 71487786813.

It is not a de Polignac number, because 31868778417 - 2¹⁴ = 31868762033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31868778467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108397059 + ... + 108397352.

It is an arithmetic number, because the mean of its divisors is an integer number (4119093828).

Almost surely, 2^31868778417 is an apocalyptic number.

It is an amenable number.

31868778417 is a deficient number, since it is larger than the sum of its proper divisors (17560347519).

31868778417 is a wasteful number, since it uses less digits than its factorization.

31868778417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216794428 (or 216794421 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 60.

The spelling of 31868778417 in words is "thirty-one billion, eight hundred sixty-eight million, seven hundred seventy-eight thousand, four hundred seventeen".