22781533 has 2 divisors, whose sum is σ = 22781534. Its totient is φ = 22781532.

The previous prime is 22781519. The next prime is 22781543. The reversal of 22781533 is 33518722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22781529 + 4 = 4773^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 22781533 - 2¹³ = 22773341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22781495 and 22781504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22781503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11390766 + 11390767.

It is an arithmetic number, because the mean of its divisors is an integer number (11390767).

Almost surely, 2^22781533 is an apocalyptic number.

It is an amenable number.

22781533 is a deficient number, since it is larger than the sum of its proper divisors (1).

22781533 is an equidigital number, since it uses as much as digits as its factorization.

22781533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 22781533 is about 4773.0004190237. Note that the first 3 decimals coincide. The cubic root of 22781533 is about 283.4834100739.

The spelling of 22781533 in words is "twenty-two million, seven hundred eighty-one thousand, five hundred thirty-three".