13345731 has 36 divisors (see below), whose sum is σ = 23435152. Its totient is φ = 7167744.

The previous prime is 13345723. The next prime is 13345747. The reversal of 13345731 is 13754331.

It is not a de Polignac number, because 13345731 - 2³ = 13345723 is a prime.

It is a super-2 number, since 2×13345731² = 356217071848722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13345695 and 13345704.

It is not an unprimeable number, because it can be changed into a prime (13345721) 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 in 35 ways as a sum of consecutive naturals, for example, 17841 + ... + 18573.

Almost surely, 2^13345731 is an apocalyptic number.

13345731 is a deficient number, since it is larger than the sum of its proper divisors (10089421).

13345731 is a wasteful number, since it uses less digits than its factorization.

13345731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 760 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 13345731 is about 3653.1809426854. The cubic root of 13345731 is about 237.1996928278.

It can be divided in two parts, 13 and 345731, that added together give a square (345744 = 588²).

The spelling of 13345731 in words is "thirteen million, three hundred forty-five thousand, seven hundred thirty-one".