23181289 has 2 divisors, whose sum is σ = 23181290. Its totient is φ = 23181288.

The previous prime is 23181269. The next prime is 23181317. The reversal of 23181289 is 98218132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 9734400 = 3667^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 23181289 - 2⁷ = 23181161 is a prime.

It is equal to p_1458961 and since 23181289 and 1458961 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (23181209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11590644 + 11590645.

It is an arithmetic number, because the mean of its divisors is an integer number (11590645).

Almost surely, 2^23181289 is an apocalyptic number.

It is an amenable number.

23181289 is a deficient number, since it is larger than the sum of its proper divisors (1).

23181289 is an equidigital number, since it uses as much as digits as its factorization.

23181289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 23181289 is about 4814.6951097655. The cubic root of 23181289 is about 285.1319344003.

The spelling of 23181289 in words is "twenty-three million, one hundred eighty-one thousand, two hundred eighty-nine".