31346639 has 2 divisors, whose sum is σ = 31346640. Its totient is φ = 31346638.

The previous prime is 31346633. The next prime is 31346671. The reversal of 31346639 is 93664313.

It is a weak prime.

It is an emirp because it is prime and its reverse (93664313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31346639 is a prime.

It is a super-2 number, since 2×31346639² = 1965223553192642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31346599 and 31346608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31346633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15673319 + 15673320.

It is an arithmetic number, because the mean of its divisors is an integer number (15673320).

Almost surely, 2^31346639 is an apocalyptic number.

31346639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31346639 is an equidigital number, since it uses as much as digits as its factorization.

31346639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 35.

The square root of 31346639 is about 5598.8069264800. The cubic root of 31346639 is about 315.3046150495.

The spelling of 31346639 in words is "thirty-one million, three hundred forty-six thousand, six hundred thirty-nine".