278590130209 has 2 divisors, whose sum is σ = 278590130210. Its totient is φ = 278590130208.

The previous prime is 278590130173. The next prime is 278590130251. The reversal of 278590130209 is 902031095872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139953054609 + 138637075600 = 374103^2 + 372340^2 .

It is a cyclic number.

It is not a de Polignac number, because 278590130209 - 2¹³ = 278590122017 is a prime.

It is a super-2 number, since 2×278590130209² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278590133209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139295065104 + 139295065105.

It is an arithmetic number, because the mean of its divisors is an integer number (139295065105).

Almost surely, 2^278590130209 is an apocalyptic number.

It is an amenable number.

278590130209 is a deficient number, since it is larger than the sum of its proper divisors (1).

278590130209 is an equidigital number, since it uses as much as digits as its factorization.

278590130209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 278590130209 in words is "two hundred seventy-eight billion, five hundred ninety million, one hundred thirty thousand, two hundred nine".