23049781 has 2 divisors, whose sum is σ = 23049782. Its totient is φ = 23049780.

The previous prime is 23049757. The next prime is 23049791. The reversal of 23049781 is 18794032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22953681 + 96100 = 4791^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 23049781 - 2¹³ = 23041589 is a prime.

It is a super-2 number, since 2×23049781² = 1062584808295922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23049701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11524890 + 11524891.

It is an arithmetic number, because the mean of its divisors is an integer number (11524891).

Almost surely, 2^23049781 is an apocalyptic number.

It is an amenable number.

23049781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23049781 is an equidigital number, since it uses as much as digits as its factorization.

23049781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 23049781 is about 4801.0187460580. The cubic root of 23049781 is about 284.5917248355.

The spelling of 23049781 in words is "twenty-three million, forty-nine thousand, seven hundred eighty-one".