22406861 has 2 divisors, whose sum is σ = 22406862. Its totient is φ = 22406860.

The previous prime is 22406851. The next prime is 22406887. The reversal of 22406861 is 16860422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 1876900 = 4531^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 22406861 - 2¹⁰ = 22405837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22406851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11203430 + 11203431.

It is an arithmetic number, because the mean of its divisors is an integer number (11203431).

Almost surely, 2^22406861 is an apocalyptic number.

It is an amenable number.

22406861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22406861 is an equidigital number, since it uses as much as digits as its factorization.

22406861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 22406861 is about 4733.5885964034. The cubic root of 22406861 is about 281.9207270093.

The spelling of 22406861 in words is "twenty-two million, four hundred six thousand, eight hundred sixty-one".