22864781 has 2 divisors, whose sum is σ = 22864782. Its totient is φ = 22864780.

The previous prime is 22864747. The next prime is 22864811. The reversal of 22864781 is 18746822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 4452100 = 4291^2 + 2110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22864781 is a prime.

It is a super-2 number, since 2×22864781² = 1045596420355922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22864181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11432390 + 11432391.

It is an arithmetic number, because the mean of its divisors is an integer number (11432391).

Almost surely, 2^22864781 is an apocalyptic number.

It is an amenable number.

22864781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22864781 is an equidigital number, since it uses as much as digits as its factorization.

22864781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 38.

The square root of 22864781 is about 4781.7131867146. The cubic root of 22864781 is about 283.8282908677.

The spelling of 22864781 in words is "twenty-two million, eight hundred sixty-four thousand, seven hundred eighty-one".