31389671 has 2 divisors, whose sum is σ = 31389672. Its totient is φ = 31389670.

The previous prime is 31389661. The next prime is 31389697. The reversal of 31389671 is 17698313.

It is a weak prime.

It is an emirp because it is prime and its reverse (17698313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31389671 is a prime.

It is a super-2 number, since 2×31389671² = 1970622890976482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31389601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15694835 + 15694836.

It is an arithmetic number, because the mean of its divisors is an integer number (15694836).

Almost surely, 2^31389671 is an apocalyptic number.

31389671 is a deficient number, since it is larger than the sum of its proper divisors (1).

31389671 is an equidigital number, since it uses as much as digits as its factorization.

31389671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 31389671 is about 5602.6485700961. The cubic root of 31389671 is about 315.4488302366.

The spelling of 31389671 in words is "thirty-one million, three hundred eighty-nine thousand, six hundred seventy-one".