13197731 has 2 divisors, whose sum is σ = 13197732. Its totient is φ = 13197730.

The previous prime is 13197719. The next prime is 13197733. The reversal of 13197731 is 13779131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13197731 - 2¹⁴ = 13181347 is a prime.

It is a super-2 number, since 2×13197731² = 348360207096722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13197733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13197733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6598865 + 6598866.

It is an arithmetic number, because the mean of its divisors is an integer number (6598866).

Almost surely, 2^13197731 is an apocalyptic number.

13197731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13197731 is an equidigital number, since it uses as much as digits as its factorization.

13197731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969, while the sum is 32.

The square root of 13197731 is about 3632.8681506490. The cubic root of 13197731 is about 236.3196079055.

The spelling of 13197731 in words is "thirteen million, one hundred ninety-seven thousand, seven hundred thirty-one".