278990093 has 2 divisors, whose sum is σ = 278990094. Its totient is φ = 278990092.

The previous prime is 278990081. The next prime is 278990113. The reversal of 278990093 is 390099872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271689289 + 7300804 = 16483^2 + 2702^2 .

It is a cyclic number.

It is not a de Polignac number, because 278990093 - 2¹⁶ = 278924557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278590093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139495046 + 139495047.

It is an arithmetic number, because the mean of its divisors is an integer number (139495047).

Almost surely, 2^278990093 is an apocalyptic number.

It is an amenable number.

278990093 is a deficient number, since it is larger than the sum of its proper divisors (1).

278990093 is an equidigital number, since it uses as much as digits as its factorization.

278990093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 278990093 is about 16702.9965275695. The cubic root of 278990093 is about 653.4257733690.

The spelling of 278990093 in words is "two hundred seventy-eight million, nine hundred ninety thousand, ninety-three".