31116139 has 2 divisors, whose sum is σ = 31116140. Its totient is φ = 31116138.

The previous prime is 31116109. The next prime is 31116191. The reversal of 31116139 is 93161113.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93161113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31116139 is a prime.

It is not a weakly prime, because it can be changed into another prime (31116109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15558069 + 15558070.

It is an arithmetic number, because the mean of its divisors is an integer number (15558070).

Almost surely, 2^31116139 is an apocalyptic number.

31116139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31116139 is an equidigital number, since it uses as much as digits as its factorization.

31116139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 25.

The square root of 31116139 is about 5578.1842027671. The cubic root of 31116139 is about 314.5298739950.

The spelling of 31116139 in words is "thirty-one million, one hundred sixteen thousand, one hundred thirty-nine".