23229781 has 2 divisors, whose sum is σ = 23229782. Its totient is φ = 23229780.

The previous prime is 23229763. The next prime is 23229823. The reversal of 23229781 is 18792232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22410756 + 819025 = 4734^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 23229781 - 2¹¹ = 23227733 is a prime.

It is a super-2 number, since 2×23229781² = 1079245450615922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23229751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11614890 + 11614891.

It is an arithmetic number, because the mean of its divisors is an integer number (11614891).

Almost surely, 2^23229781 is an apocalyptic number.

It is an amenable number.

23229781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23229781 is an equidigital number, since it uses as much as digits as its factorization.

23229781 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23229781 is about 4819.7283118450. The cubic root of 23229781 is about 285.3306145777.

The spelling of 23229781 in words is "twenty-three million, two hundred twenty-nine thousand, seven hundred eighty-one".