31122643 has 2 divisors, whose sum is σ = 31122644. Its totient is φ = 31122642.

The previous prime is 31122629. The next prime is 31122647. The reversal of 31122643 is 34622113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31122643 - 2¹³ = 31114451 is a prime.

It is not a weakly prime, because it can be changed into another prime (31122647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561321 + 15561322.

It is an arithmetic number, because the mean of its divisors is an integer number (15561322).

Almost surely, 2^31122643 is an apocalyptic number.

31122643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122643 is an equidigital number, since it uses as much as digits as its factorization.

31122643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 31122643 is about 5578.7671577150. The cubic root of 31122643 is about 314.5517871656.

Adding to 31122643 its reverse (34622113), we get a palindrome (65744756).

The spelling of 31122643 in words is "thirty-one million, one hundred twenty-two thousand, six hundred forty-three".