3121222331 has 4 divisors (see below), whose sum is σ = 3129727392. Its totient is φ = 3112717272.

The previous prime is 3121222309. The next prime is 3121222339. The reversal of 3121222331 is 1332221213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3121222331 - 2¹⁸ = 3120960187 is a prime.

It is a super-2 number, since 2×3121222331² = 19484057679066147122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121222339) 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, 4251980 + ... + 4252713.

It is an arithmetic number, because the mean of its divisors is an integer number (782431848).

Almost surely, 2^3121222331 is an apocalyptic number.

3121222331 is a deficient number, since it is larger than the sum of its proper divisors (8505061).

3121222331 is an equidigital number, since it uses as much as digits as its factorization.

3121222331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8505060.

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

The square root of 3121222331 is about 55867.9007212550. The cubic root of 3121222331 is about 1461.4195130987.

Adding to 3121222331 its reverse (1332221213), we get a palindrome (4453443544).

The spelling of 3121222331 in words is "three billion, one hundred twenty-one million, two hundred twenty-two thousand, three hundred thirty-one".