31706645539 has 2 divisors, whose sum is σ = 31706645540. Its totient is φ = 31706645538.

The previous prime is 31706645473. The next prime is 31706645543. The reversal of 31706645539 is 93554660713.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31706645539 is a prime.

It is a super-2 number, since 2×31706645539² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31706645492 and 31706645501.

It is not a weakly prime, because it can be changed into another prime (31106645539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15853322769 + 15853322770.

It is an arithmetic number, because the mean of its divisors is an integer number (15853322770).

Almost surely, 2^31706645539 is an apocalyptic number.

31706645539 is a deficient number, since it is larger than the sum of its proper divisors (1).

31706645539 is an equidigital number, since it uses as much as digits as its factorization.

31706645539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 49.

The spelling of 31706645539 in words is "thirty-one billion, seven hundred six million, six hundred forty-five thousand, five hundred thirty-nine".