31270139 has 2 divisors, whose sum is σ = 31270140. Its totient is φ = 31270138.

The previous prime is 31270121. The next prime is 31270147. The reversal of 31270139 is 93107213.

It is a strong prime.

It is an emirp because it is prime and its reverse (93107213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31270139 is a prime.

It is not a weakly prime, because it can be changed into another prime (31270199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15635069 + 15635070.

It is an arithmetic number, because the mean of its divisors is an integer number (15635070).

Almost surely, 2^31270139 is an apocalyptic number.

31270139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31270139 is an equidigital number, since it uses as much as digits as its factorization.

31270139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 31270139 is about 5591.9709405540. The cubic root of 31270139 is about 315.0479107439.

The spelling of 31270139 in words is "thirty-one million, two hundred seventy thousand, one hundred thirty-nine".