31710139 has 2 divisors, whose sum is σ = 31710140. Its totient is φ = 31710138.

The previous prime is 31710103. The next prime is 31710143. The reversal of 31710139 is 93101713.

It is a strong prime.

It is an emirp because it is prime and its reverse (93101713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31710139 - 2¹¹ = 31708091 is a prime.

It is not a weakly prime, because it can be changed into another prime (31710149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15855069 + 15855070.

It is an arithmetic number, because the mean of its divisors is an integer number (15855070).

Almost surely, 2^31710139 is an apocalyptic number.

31710139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31710139 is an equidigital number, since it uses as much as digits as its factorization.

31710139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 31710139 is about 5631.1756321393. The cubic root of 31710139 is about 316.5187062543.

The spelling of 31710139 in words is "thirty-one million, seven hundred ten thousand, one hundred thirty-nine".