31591021139 has 2 divisors, whose sum is σ = 31591021140. Its totient is φ = 31591021138.

The previous prime is 31591021127. The next prime is 31591021201. The reversal of 31591021139 is 93112019513.

It is a weak prime.

It is an emirp because it is prime and its reverse (93112019513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31591021139 - 2⁸ = 31591020883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31591021099 and 31591021108.

It is not a weakly prime, because it can be changed into another prime (31591021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15795510569 + 15795510570.

It is an arithmetic number, because the mean of its divisors is an integer number (15795510570).

Almost surely, 2^31591021139 is an apocalyptic number.

31591021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31591021139 is an equidigital number, since it uses as much as digits as its factorization.

31591021139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 35.

The spelling of 31591021139 in words is "thirty-one billion, five hundred ninety-one million, twenty-one thousand, one hundred thirty-nine".