31041320321 has 4 divisors (see below), whose sum is σ = 33863258544. Its totient is φ = 28219382100.

The previous prime is 31041320309. The next prime is 31041320333. The reversal of 31041320321 is 12302314013.

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: 12302314013 = 11 ⋅1118392183.

It is an interprime number because it is at equal distance from previous prime (31041320309) and next prime (31041320333).

It is a cyclic number.

It is not a de Polignac number, because 31041320321 - 2⁶ = 31041320257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31041320293 and 31041320302.

It is not an unprimeable number, because it can be changed into a prime (31041320351) 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, 1410969095 + ... + 1410969116.

It is an arithmetic number, because the mean of its divisors is an integer number (8465814636).

Almost surely, 2^31041320321 is an apocalyptic number.

It is an amenable number.

31041320321 is a deficient number, since it is larger than the sum of its proper divisors (2821938223).

31041320321 is a wasteful number, since it uses less digits than its factorization.

31041320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821938222.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31041320321 its reverse (12302314013), we get a palindrome (43343634334).

The spelling of 31041320321 in words is "thirty-one billion, forty-one million, three hundred twenty thousand, three hundred twenty-one".