23033981 has 2 divisors, whose sum is σ = 23033982. Its totient is φ = 23033980.

The previous prime is 23033977. The next prime is 23033987. The reversal of 23033981 is 18933032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22714756 + 319225 = 4766^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 23033981 - 2² = 23033977 is a prime.

It is a super-2 number, since 2×23033981² = 1061128561416722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23033987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11516990 + 11516991.

It is an arithmetic number, because the mean of its divisors is an integer number (11516991).

Almost surely, 2^23033981 is an apocalyptic number.

It is an amenable number.

23033981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23033981 is an equidigital number, since it uses as much as digits as its factorization.

23033981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 23033981 is about 4799.3729798798. The cubic root of 23033981 is about 284.5266833345.

The spelling of 23033981 in words is "twenty-three million, thirty-three thousand, nine hundred eighty-one".