56278213 has 2 divisors, whose sum is σ = 56278214. Its totient is φ = 56278212.

The previous prime is 56278169. The next prime is 56278231. The reversal of 56278213 is 31287265.

It is a happy number.

Together with next prime (56278231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48972004 + 7306209 = 6998^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 56278213 - 2¹³ = 56270021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56278253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28139106 + 28139107.

It is an arithmetic number, because the mean of its divisors is an integer number (28139107).

Almost surely, 2^56278213 is an apocalyptic number.

It is an amenable number.

56278213 is a deficient number, since it is larger than the sum of its proper divisors (1).

56278213 is an equidigital number, since it uses as much as digits as its factorization.

56278213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 56278213 is about 7501.8806308818. The cubic root of 56278213 is about 383.2187644173.

The spelling of 56278213 in words is "fifty-six million, two hundred seventy-eight thousand, two hundred thirteen".