23210981 has 2 divisors, whose sum is σ = 23210982. Its totient is φ = 23210980.

The previous prime is 23210969. The next prime is 23210987. The reversal of 23210981 is 18901232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14508481 + 8702500 = 3809^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 23210981 - 2¹⁸ = 22948837 is a prime.

It is a super-2 number, since 2×23210981² = 1077499277964722, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 23210981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23210987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605490 + 11605491.

It is an arithmetic number, because the mean of its divisors is an integer number (11605491).

Almost surely, 2^23210981 is an apocalyptic number.

It is an amenable number.

23210981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23210981 is an equidigital number, since it uses as much as digits as its factorization.

23210981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 23210981 is about 4817.7775996822. Note that the first 3 decimals coincide. The cubic root of 23210981 is about 285.2536205487.

The spelling of 23210981 in words is "twenty-three million, two hundred ten thousand, nine hundred eighty-one".