22231861 has 2 divisors, whose sum is σ = 22231862. Its totient is φ = 22231860.

The previous prime is 22231789. The next prime is 22231883. The reversal of 22231861 is 16813222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 5788836 = 4055^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 22231861 - 2¹¹ = 22229813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22231361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11115930 + 11115931.

It is an arithmetic number, because the mean of its divisors is an integer number (11115931).

Almost surely, 2^22231861 is an apocalyptic number.

It is an amenable number.

22231861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22231861 is an equidigital number, since it uses as much as digits as its factorization.

22231861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 22231861 is about 4715.0674438443. The cubic root of 22231861 is about 281.1848641918.

The spelling of 22231861 in words is "twenty-two million, two hundred thirty-one thousand, eight hundred sixty-one".