23279981 has 2 divisors, whose sum is σ = 23279982. Its totient is φ = 23279980.

The previous prime is 23279951. The next prime is 23280013. The reversal of 23279981 is 18997232.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 5597956 = 4205^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 23279981 - 2⁶ = 23279917 is a prime.

It is a super-2 number, since 2×23279981² = 1083915030720722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23279941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639990 + 11639991.

It is an arithmetic number, because the mean of its divisors is an integer number (11639991).

Almost surely, 2^23279981 is an apocalyptic number.

It is an amenable number.

23279981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23279981 is an equidigital number, since it uses as much as digits as its factorization.

23279981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 23279981 is about 4824.9332637872. The cubic root of 23279981 is about 285.5360016678.

The spelling of 23279981 in words is "twenty-three million, two hundred seventy-nine thousand, nine hundred eighty-one".