13071731 has 2 divisors, whose sum is σ = 13071732. Its totient is φ = 13071730.

The previous prime is 13071689. The next prime is 13071733. The reversal of 13071731 is 13717031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13071731 - 2¹⁴ = 13055347 is a prime.

It is a super-2 number, since 2×13071731² = 341740302672722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13071733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13071697 and 13071706.

It is not a weakly prime, because it can be changed into another prime (13071733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6535865 + 6535866.

It is an arithmetic number, because the mean of its divisors is an integer number (6535866).

Almost surely, 2^13071731 is an apocalyptic number.

13071731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13071731 is an equidigital number, since it uses as much as digits as its factorization.

13071731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 441, while the sum is 23.

The square root of 13071731 is about 3615.4848914081. The cubic root of 13071731 is about 235.5651465166.

Adding to 13071731 its reverse (13717031), we get a palindrome (26788762).

The spelling of 13071731 in words is "thirteen million, seventy-one thousand, seven hundred thirty-one".