23131811 has 2 divisors, whose sum is σ = 23131812. Its totient is φ = 23131810.

The previous prime is 23131793. The next prime is 23131837. The reversal of 23131811 is 11813132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131811 is a prime.

It is not a weakly prime, because it can be changed into another prime (23131861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565905 + 11565906.

It is an arithmetic number, because the mean of its divisors is an integer number (11565906).

Almost surely, 2^23131811 is an apocalyptic number.

23131811 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131811 is an equidigital number, since it uses as much as digits as its factorization.

23131811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 23131811 is about 4809.5541373396. The cubic root of 23131811 is about 284.9289286206.

Adding to 23131811 its reverse (11813132), we get a palindrome (34944943).

The spelling of 23131811 in words is "twenty-three million, one hundred thirty-one thousand, eight hundred eleven".