278112321 has 6 divisors (see below), whose sum is σ = 401717810. Its totient is φ = 185408208.

The previous prime is 278112319. The next prime is 278112337. The reversal of 278112321 is 123211872.

It can be written as a sum of positive squares in only one way, i.e., 271063296 + 7049025 = 16464^2 + 2655^2 .

It is not a de Polignac number, because 278112321 - 2¹ = 278112319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278112361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15450676 + ... + 15450693.

Almost surely, 2^278112321 is an apocalyptic number.

It is an amenable number.

278112321 is a deficient number, since it is larger than the sum of its proper divisors (123605489).

278112321 is a wasteful number, since it uses less digits than its factorization.

278112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30901375 (or 30901372 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 278112321 is about 16676.6999433341. The cubic root of 278112321 is about 652.7397735965.

The spelling of 278112321 in words is "two hundred seventy-eight million, one hundred twelve thousand, three hundred twenty-one".