23331281 has 2 divisors, whose sum is σ = 23331282. Its totient is φ = 23331280.

The previous prime is 23331277. The next prime is 23331353. The reversal of 23331281 is 18213332.

23331281 = 3415² + 3416².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11669056 + 11662225 = 3416^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 23331281 - 2² = 23331277 is a prime.

It is a super-2 number, since 2×23331281² = 1088697346201922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23331271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11665640 + 11665641.

It is an arithmetic number, because the mean of its divisors is an integer number (11665641).

Almost surely, 2^23331281 is an apocalyptic number.

23331281 is the 3416-th centered square number.

It is an amenable number.

23331281 is a deficient number, since it is larger than the sum of its proper divisors (1).

23331281 is an equidigital number, since it uses as much as digits as its factorization.

23331281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 23331281 is about 4830.2464740425. The cubic root of 23331281 is about 285.7455844641.

The spelling of 23331281 in words is "twenty-three million, three hundred thirty-one thousand, two hundred eighty-one".