278053213 has 2 divisors, whose sum is σ = 278053214. Its totient is φ = 278053212.

The previous prime is 278053199. The next prime is 278053231. The reversal of 278053213 is 312350872.

Together with next prime (278053231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237067609 + 40985604 = 15397^2 + 6402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278053213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278053613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139026606 + 139026607.

It is an arithmetic number, because the mean of its divisors is an integer number (139026607).

Almost surely, 2^278053213 is an apocalyptic number.

It is an amenable number.

278053213 is a deficient number, since it is larger than the sum of its proper divisors (1).

278053213 is an equidigital number, since it uses as much as digits as its factorization.

278053213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 278053213 is about 16674.9276760051. The cubic root of 278053213 is about 652.6935274419.

The spelling of 278053213 in words is "two hundred seventy-eight million, fifty-three thousand, two hundred thirteen".