13643731 has 2 divisors, whose sum is σ = 13643732. Its totient is φ = 13643730.

The previous prime is 13643723. The next prime is 13643743. The reversal of 13643731 is 13734631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13643731 - 2³ = 13643723 is a prime.

It is a super-2 number, since 2×13643731² = 372302791200722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13643731.

It is not a weakly prime, because it can be changed into another prime (13643711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821865 + 6821866.

It is an arithmetic number, because the mean of its divisors is an integer number (6821866).

Almost surely, 2^13643731 is an apocalyptic number.

13643731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13643731 is an equidigital number, since it uses as much as digits as its factorization.

13643731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 28.

The square root of 13643731 is about 3693.7421404316. The cubic root of 13643731 is about 238.9522088344.

The spelling of 13643731 in words is "thirteen million, six hundred forty-three thousand, seven hundred thirty-one".