13641731 has 4 divisors (see below), whose sum is σ = 13654464. Its totient is φ = 13629000.

The previous prime is 13641721. The next prime is 13641739. The reversal of 13641731 is 13714631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13641731 is a prime.

It is a super-2 number, since 2×13641731² = 372193649352722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13641731.

It is not an unprimeable number, because it can be changed into a prime (13641739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4595 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (3413616).

Almost surely, 2^13641731 is an apocalyptic number.

13641731 is a deficient number, since it is larger than the sum of its proper divisors (12733).

13641731 is a wasteful number, since it uses less digits than its factorization.

13641731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12732.

The product of its digits is 1512, while the sum is 26.

The square root of 13641731 is about 3693.4714023531. The cubic root of 13641731 is about 238.9405324640.

Subtracting 13641731 from its reverse (13714631), we obtain a square (72900 = 270²).

The spelling of 13641731 in words is "thirteen million, six hundred forty-one thousand, seven hundred thirty-one".