31643449 has 4 divisors (see below), whose sum is σ = 31781860. Its totient is φ = 31505040.

The previous prime is 31643429. The next prime is 31643461. The reversal of 31643449 is 94434613.

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 28729600 + 2913849 = 5360^2 + 1707^2 .

It is a cyclic number.

It is not a de Polignac number, because 31643449 - 2⁹ = 31642937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31643419) 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, 68862 + ... + 69319.

It is an arithmetic number, because the mean of its divisors is an integer number (7945465).

Almost surely, 2^31643449 is an apocalyptic number.

It is an amenable number.

31643449 is a deficient number, since it is larger than the sum of its proper divisors (138411).

31643449 is a wasteful number, since it uses less digits than its factorization.

31643449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138410.

The product of its digits is 31104, while the sum is 34.

The square root of 31643449 is about 5625.2510166214. The cubic root of 31643449 is about 316.2966590012.

The spelling of 31643449 in words is "thirty-one million, six hundred forty-three thousand, four hundred forty-nine".