22083781 has 2 divisors, whose sum is σ = 22083782. Its totient is φ = 22083780.

The previous prime is 22083779. The next prime is 22083791. The reversal of 22083781 is 18738022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17715681 + 4368100 = 4209^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 22083781 - 2¹ = 22083779 is a prime.

It is a super-2 number, since 2×22083781² = 975386766511922, which contains 22 as substring.

Together with 22083779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22083701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11041890 + 11041891.

It is an arithmetic number, because the mean of its divisors is an integer number (11041891).

Almost surely, 2^22083781 is an apocalyptic number.

It is an amenable number.

22083781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22083781 is an equidigital number, since it uses as much as digits as its factorization.

22083781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 22083781 is about 4699.3383576840. The cubic root of 22083781 is about 280.5591759179.

The spelling of 22083781 in words is "twenty-two million, eighty-three thousand, seven hundred eighty-one".