31678693897 has 2 divisors, whose sum is σ = 31678693898. Its totient is φ = 31678693896.

The previous prime is 31678693847. The next prime is 31678693933. The reversal of 31678693897 is 79839687613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31651612281 + 27081616 = 177909^2 + 5204^2 .

It is a cyclic number.

It is not a de Polignac number, because 31678693897 - 2⁷ = 31678693769 is a prime.

It is a super-3 number, since 3×31678693897³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31678693817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15839346948 + 15839346949.

It is an arithmetic number, because the mean of its divisors is an integer number (15839346949).

Almost surely, 2^31678693897 is an apocalyptic number.

It is an amenable number.

31678693897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31678693897 is an equidigital number, since it uses as much as digits as its factorization.

31678693897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 67.

The spelling of 31678693897 in words is "thirty-one billion, six hundred seventy-eight million, six hundred ninety-three thousand, eight hundred ninety-seven".