13431749 has 4 divisors (see below), whose sum is σ = 13454700. Its totient is φ = 13408800.

The previous prime is 13431739. The next prime is 13431757. The reversal of 13431749 is 94713431.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 6723649 = 2590^2 + 2593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13431749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10574 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (3363675).

Almost surely, 2^13431749 is an apocalyptic number.

It is an amenable number.

13431749 is a deficient number, since it is larger than the sum of its proper divisors (22951).

13431749 is an equidigital number, since it uses as much as digits as its factorization.

13431749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22950.

The product of its digits is 9072, while the sum is 32.

The square root of 13431749 is about 3664.9350608162. The cubic root of 13431749 is about 237.7082140832.

The spelling of 13431749 in words is "thirteen million, four hundred thirty-one thousand, seven hundred forty-nine".