31440804413 has 4 divisors (see below), whose sum is σ = 31441316508. Its totient is φ = 31440292320.

The previous prime is 31440804397. The next prime is 31440804491.

31440804413 is nontrivially palindromic in base 10.

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 15049891684 + 16390912729 = 122678^2 + 128027^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440804413 - 2⁴ = 31440804397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31440804413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440804013) 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, 149048 + ... + 291713.

It is an arithmetic number, because the mean of its divisors is an integer number (7860329127).

Almost surely, 2^31440804413 is an apocalyptic number.

It is an amenable number.

31440804413 is a deficient number, since it is larger than the sum of its proper divisors (512095).

31440804413 is an equidigital number, since it uses as much as digits as its factorization.

31440804413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512094.

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 31440804413 in words is "thirty-one billion, four hundred forty million, eight hundred four thousand, four hundred thirteen".