23140813 has 2 divisors, whose sum is σ = 23140814. Its totient is φ = 23140812.

The previous prime is 23140771. The next prime is 23140823. The reversal of 23140813 is 31804132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12369289 + 10771524 = 3517^2 + 3282^2 .

It is a cyclic number.

It is not a de Polignac number, because 23140813 - 2²¹ = 21043661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23140823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11570406 + 11570407.

It is an arithmetic number, because the mean of its divisors is an integer number (11570407).

Almost surely, 2^23140813 is an apocalyptic number.

It is an amenable number.

23140813 is a deficient number, since it is larger than the sum of its proper divisors (1).

23140813 is an equidigital number, since it uses as much as digits as its factorization.

23140813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 23140813 is about 4810.4898918925. The cubic root of 23140813 is about 284.9658849080.

Adding to 23140813 its reverse (31804132), we get a palindrome (54944945).

The spelling of 23140813 in words is "twenty-three million, one hundred forty thousand, eight hundred thirteen".