31683432139 has 2 divisors, whose sum is σ = 31683432140. Its totient is φ = 31683432138.

The previous prime is 31683432097. The next prime is 31683432161. The reversal of 31683432139 is 93123438613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31683432139 - 2²¹ = 31681334987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31683432095 and 31683432104.

It is not a weakly prime, because it can be changed into another prime (31683132139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15841716069 + 15841716070.

It is an arithmetic number, because the mean of its divisors is an integer number (15841716070).

Almost surely, 2^31683432139 is an apocalyptic number.

31683432139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31683432139 is an equidigital number, since it uses as much as digits as its factorization.

31683432139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 43.

The spelling of 31683432139 in words is "thirty-one billion, six hundred eighty-three million, four hundred thirty-two thousand, one hundred thirty-nine".