22237781 has 2 divisors, whose sum is σ = 22237782. Its totient is φ = 22237780.

The previous prime is 22237763. The next prime is 22237799. The reversal of 22237781 is 18773222.

22237781 = 3334² + 3335².

It is a balanced prime because it is at equal distance from previous prime (22237763) and next prime (22237799).

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 11115556 = 3335^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 22237781 - 2¹⁸ = 21975637 is a prime.

It is a super-2 number, since 2×22237781² = 989037807607922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22237681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11118890 + 11118891.

It is an arithmetic number, because the mean of its divisors is an integer number (11118891).

Almost surely, 2^22237781 is an apocalyptic number.

22237781 is the 3335-th centered square number.

It is an amenable number.

22237781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22237781 is an equidigital number, since it uses as much as digits as its factorization.

22237781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 22237781 is about 4715.6951767475. The cubic root of 22237781 is about 281.2098203672.

The spelling of 22237781 in words is "twenty-two million, two hundred thirty-seven thousand, seven hundred eighty-one".