22943881 has 2 divisors, whose sum is σ = 22943882. Its totient is φ = 22943880.

The previous prime is 22943873. The next prime is 22943909. The reversal of 22943881 is 18834922.

It is the 1956-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22848400 + 95481 = 4780^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 22943881 - 2³ = 22943873 is a prime.

It is a super-2 number, since 2×22943881² = 1052843350684322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22943881.

It is not a weakly prime, because it can be changed into another prime (22943831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11471940 + 11471941.

It is an arithmetic number, because the mean of its divisors is an integer number (11471941).

Almost surely, 2^22943881 is an apocalyptic number.

It is an amenable number.

22943881 is a deficient number, since it is larger than the sum of its proper divisors (1).

22943881 is an equidigital number, since it uses as much as digits as its factorization.

22943881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 22943881 is about 4789.9771398202. The cubic root of 22943881 is about 284.1552125520.

The spelling of 22943881 in words is "twenty-two million, nine hundred forty-three thousand, eight hundred eighty-one".