23041981 has 2 divisors, whose sum is σ = 23041982. Its totient is φ = 23041980.

The previous prime is 23041973. The next prime is 23041999. The reversal of 23041981 is 18914032.

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., 19061956 + 3980025 = 4366^2 + 1995^2 .

It is a cyclic number.

It is not a de Polignac number, because 23041981 - 2³ = 23041973 is a prime.

It is a super-2 number, since 2×23041981² = 1061865776808722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23041951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11520990 + 11520991.

It is an arithmetic number, because the mean of its divisors is an integer number (11520991).

Almost surely, 2^23041981 is an apocalyptic number.

It is an amenable number.

23041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23041981 is an equidigital number, since it uses as much as digits as its factorization.

23041981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 23041981 is about 4800.2063497312. The cubic root of 23041981 is about 284.5596194561.

The spelling of 23041981 in words is "twenty-three million, forty-one thousand, nine hundred eighty-one".