23085781 has 2 divisors, whose sum is σ = 23085782. Its totient is φ = 23085780.

The previous prime is 23085773. The next prime is 23085823. The reversal of 23085781 is 18758032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 285156 = 4775^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 23085781 - 2³ = 23085773 is a prime.

It is a super-2 number, since 2×23085781² = 1065906568759922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23085761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11542890 + 11542891.

It is an arithmetic number, because the mean of its divisors is an integer number (11542891).

Almost surely, 2^23085781 is an apocalyptic number.

It is an amenable number.

23085781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23085781 is an equidigital number, since it uses as much as digits as its factorization.

23085781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 23085781 is about 4804.7664875621. The cubic root of 23085781 is about 284.7398097260.

The spelling of 23085781 in words is "twenty-three million, eighty-five thousand, seven hundred eighty-one".