31345321 has 4 divisors (see below), whose sum is σ = 35823232. Its totient is φ = 26867412.

The previous prime is 31345283. The next prime is 31345333. The reversal of 31345321 is 12354313.

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: 12354313 = 19 ⋅650227.

It is a cyclic number.

It is not a de Polignac number, because 31345321 - 2¹³ = 31337129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31345292 and 31345301.

It is not an unprimeable number, because it can be changed into a prime (31345121) 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, 2238945 + ... + 2238958.

It is an arithmetic number, because the mean of its divisors is an integer number (8955808).

Almost surely, 2^31345321 is an apocalyptic number.

It is an amenable number.

31345321 is a deficient number, since it is larger than the sum of its proper divisors (4477911).

31345321 is an equidigital number, since it uses as much as digits as its factorization.

31345321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477910.

The product of its digits is 1080, while the sum is 22.

The square root of 31345321 is about 5598.6892215946. The cubic root of 31345321 is about 315.3001958910.

Adding to 31345321 its reverse (12354313), we get a palindrome (43699634).

The spelling of 31345321 in words is "thirty-one million, three hundred forty-five thousand, three hundred twenty-one".