31342139 has 2 divisors, whose sum is σ = 31342140. Its totient is φ = 31342138.

The previous prime is 31342121. The next prime is 31342159. The reversal of 31342139 is 93124313.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93124313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31342139 is a prime.

It is not a weakly prime, because it can be changed into another prime (31342159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671069 + 15671070.

It is an arithmetic number, because the mean of its divisors is an integer number (15671070).

Almost surely, 2^31342139 is an apocalyptic number.

31342139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31342139 is an equidigital number, since it uses as much as digits as its factorization.

31342139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 31342139 is about 5598.4050407237. The cubic root of 31342139 is about 315.2895263647.

The spelling of 31342139 in words is "thirty-one million, three hundred forty-two thousand, one hundred thirty-nine".