23143781 has 2 divisors, whose sum is σ = 23143782. Its totient is φ = 23143780.

The previous prime is 23143741. The next prime is 23143793. The reversal of 23143781 is 18734132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22714756 + 429025 = 4766^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 23143781 - 2⁶ = 23143717 is a prime.

It is a super-2 number, since 2×23143781² = 1071269197951922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23143741) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11571890 + 11571891.

It is an arithmetic number, because the mean of its divisors is an integer number (11571891).

Almost surely, 2^23143781 is an apocalyptic number.

It is an amenable number.

23143781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23143781 is an equidigital number, since it uses as much as digits as its factorization.

23143781 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23143781 is about 4810.7983744905. The cubic root of 23143781 is about 284.9780674617.

The spelling of 23143781 in words is "twenty-three million, one hundred forty-three thousand, seven hundred eighty-one".