31031009189 has 2 divisors, whose sum is σ = 31031009190. Its totient is φ = 31031009188.

The previous prime is 31031009137. The next prime is 31031009221. The reversal of 31031009189 is 98190013013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16891421089 + 14139588100 = 129967^2 + 118910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031009189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31031009129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515504594 + 15515504595.

It is an arithmetic number, because the mean of its divisors is an integer number (15515504595).

Almost surely, 2^31031009189 is an apocalyptic number.

It is an amenable number.

31031009189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031009189 is an equidigital number, since it uses as much as digits as its factorization.

31031009189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 31031009189 in words is "thirty-one billion, thirty-one million, nine thousand, one hundred eighty-nine".