23781143 has 2 divisors, whose sum is σ = 23781144. Its totient is φ = 23781142.

The previous prime is 23781139. The next prime is 23781151. The reversal of 23781143 is 34118732.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23781143 - 2² = 23781139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23783143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11890571 + 11890572.

It is an arithmetic number, because the mean of its divisors is an integer number (11890572).

Almost surely, 2^23781143 is an apocalyptic number.

23781143 is a deficient number, since it is larger than the sum of its proper divisors (1).

23781143 is an equidigital number, since it uses as much as digits as its factorization.

23781143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 23781143 is about 4876.5913300173. The cubic root of 23781143 is about 287.5704397031.

Adding to 23781143 its reverse (34118732), we get a palindrome (57899875).

The spelling of 23781143 in words is "twenty-three million, seven hundred eighty-one thousand, one hundred forty-three".