22278029 has 2 divisors, whose sum is σ = 22278030. Its totient is φ = 22278028.

The previous prime is 22278017. The next prime is 22278037. The reversal of 22278029 is 92087222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 4721929 = 4190^2 + 2173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22278029 is a prime.

It is a super-2 number, since 2×22278029² = 992621152249682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22277986 and 22278004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22278229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11139014 + 11139015.

It is an arithmetic number, because the mean of its divisors is an integer number (11139015).

Almost surely, 2^22278029 is an apocalyptic number.

It is an amenable number.

22278029 is a deficient number, since it is larger than the sum of its proper divisors (1).

22278029 is an equidigital number, since it uses as much as digits as its factorization.

22278029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 22278029 is about 4719.9606989889. The cubic root of 22278029 is about 281.3793713295.

The spelling of 22278029 in words is "twenty-two million, two hundred seventy-eight thousand, twenty-nine".