23281493 has 2 divisors, whose sum is σ = 23281494. Its totient is φ = 23281492.

The previous prime is 23281471. The next prime is 23281499. The reversal of 23281493 is 39418232.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23261329 + 20164 = 4823^2 + 142^2 .

It is a cyclic number.

It is not a de Polignac number, because 23281493 - 2¹⁰ = 23280469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23281499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11640746 + 11640747.

It is an arithmetic number, because the mean of its divisors is an integer number (11640747).

Almost surely, 2^23281493 is an apocalyptic number.

It is an amenable number.

23281493 is a deficient number, since it is larger than the sum of its proper divisors (1).

23281493 is an equidigital number, since it uses as much as digits as its factorization.

23281493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 23281493 is about 4825.0899473481. The cubic root of 23281493 is about 285.5421832463.

The spelling of 23281493 in words is "twenty-three million, two hundred eighty-one thousand, four hundred ninety-three".