34278221 has 2 divisors, whose sum is σ = 34278222. Its totient is φ = 34278220.

The previous prime is 34278217. The next prime is 34278247. The reversal of 34278221 is 12287243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 4182025 = 5486^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 34278221 - 2² = 34278217 is a prime.

It is a super-4 number, since 4×34278221⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34271221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17139110 + 17139111.

It is an arithmetic number, because the mean of its divisors is an integer number (17139111).

Almost surely, 2^34278221 is an apocalyptic number.

It is an amenable number.

34278221 is a deficient number, since it is larger than the sum of its proper divisors (1).

34278221 is an equidigital number, since it uses as much as digits as its factorization.

34278221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 34278221 is about 5854.7605416447. The cubic root of 34278221 is about 324.8424356546.

The spelling of 34278221 in words is "thirty-four million, two hundred seventy-eight thousand, two hundred twenty-one".