13709831 has 2 divisors, whose sum is σ = 13709832. Its totient is φ = 13709830.

The previous prime is 13709809. The next prime is 13709833. The reversal of 13709831 is 13890731.

It is a strong prime.

It is an emirp because it is prime and its reverse (13890731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13709831 is a prime.

It is a super-2 number, since 2×13709831² = 375918932097122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13709833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13709833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6854915 + 6854916.

It is an arithmetic number, because the mean of its divisors is an integer number (6854916).

Almost surely, 2^13709831 is an apocalyptic number.

13709831 is a deficient number, since it is larger than the sum of its proper divisors (1).

13709831 is an equidigital number, since it uses as much as digits as its factorization.

13709831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 13709831 is about 3702.6788950704. The cubic root of 13709831 is about 239.3374725237.

The spelling of 13709831 in words is "thirteen million, seven hundred nine thousand, eight hundred thirty-one".