31540243441 has 4 divisors (see below), whose sum is σ = 36045992512. Its totient is φ = 27034494372.

The previous prime is 31540243421. The next prime is 31540243477. The reversal of 31540243441 is 14434204513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14434204513 = 2777 ⋅5197769.

It is a cyclic number.

It is not a de Polignac number, because 31540243441 - 2¹⁵ = 31540210673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540243421) 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, 2252874525 + ... + 2252874538.

It is an arithmetic number, because the mean of its divisors is an integer number (9011498128).

Almost surely, 2^31540243441 is an apocalyptic number.

It is an amenable number.

31540243441 is a deficient number, since it is larger than the sum of its proper divisors (4505749071).

31540243441 is an equidigital number, since it uses as much as digits as its factorization.

31540243441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505749070.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 31540243441 its reverse (14434204513), we get a palindrome (45974447954).

The spelling of 31540243441 in words is "thirty-one billion, five hundred forty million, two hundred forty-three thousand, four hundred forty-one".