23201989 has 2 divisors, whose sum is σ = 23201990. Its totient is φ = 23201988.

The previous prime is 23201953. The next prime is 23201999. The reversal of 23201989 is 98910232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22877089 + 324900 = 4783^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 23201989 - 2¹⁵ = 23169221 is a prime.

It is a super-2 number, since 2×23201989² = 1076664587112242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23201929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11600994 + 11600995.

It is an arithmetic number, because the mean of its divisors is an integer number (11600995).

Almost surely, 2^23201989 is an apocalyptic number.

It is an amenable number.

23201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23201989 is an equidigital number, since it uses as much as digits as its factorization.

23201989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 23201989 is about 4816.8442989160. The cubic root of 23201989 is about 285.2167797698.

The spelling of 23201989 in words is "twenty-three million, two hundred one thousand, nine hundred eighty-nine".