23213131 has 2 divisors, whose sum is σ = 23213132. Its totient is φ = 23213130.

The previous prime is 23213087. The next prime is 23213147. The reversal of 23213131 is 13131232.

It is an a-pointer prime, because the next prime (23213147) can be obtained adding 23213131 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23213131 is a prime.

It is a super-2 number, since 2×23213131² = 1077698901646322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23213161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606565 + 11606566.

It is an arithmetic number, because the mean of its divisors is an integer number (11606566).

Almost surely, 2^23213131 is an apocalyptic number.

23213131 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213131 is an equidigital number, since it uses as much as digits as its factorization.

23213131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 16.

The square root of 23213131 is about 4818.0007264425. Note that the first 3 decimals coincide. The cubic root of 23213131 is about 285.2624278218.

Adding to 23213131 its reverse (13131232), we get a palindrome (36344363).

The spelling of 23213131 in words is "twenty-three million, two hundred thirteen thousand, one hundred thirty-one".