31540043441 has 4 divisors (see below), whose sum is σ = 33395340132. Its totient is φ = 29684746752.

The previous prime is 31540043429. The next prime is 31540043449. The reversal of 31540043441 is 14434004513.

It is a happy number.

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 24210115216 + 7329928225 = 155596^2 + 85615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31540043441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540043449) 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, 927648320 + ... + 927648353.

It is an arithmetic number, because the mean of its divisors is an integer number (8348835033).

Almost surely, 2^31540043441 is an apocalyptic number.

It is an amenable number.

31540043441 is a deficient number, since it is larger than the sum of its proper divisors (1855296691).

31540043441 is a wasteful number, since it uses less digits than its factorization.

31540043441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855296690.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 31540043441 its reverse (14434004513), we get a palindrome (45974047954).

The spelling of 31540043441 in words is "thirty-one billion, five hundred forty million, forty-three thousand, four hundred forty-one".