279381822397 has 2 divisors, whose sum is σ = 279381822398. Its totient is φ = 279381822396.

The previous prime is 279381822389. The next prime is 279381822403. The reversal of 279381822397 is 793228183972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273391991161 + 5989831236 = 522869^2 + 77394^2 .

It is a cyclic number.

It is not a de Polignac number, because 279381822397 - 2³ = 279381822389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279381802397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139690911198 + 139690911199.

It is an arithmetic number, because the mean of its divisors is an integer number (139690911199).

Almost surely, 2^279381822397 is an apocalyptic number.

It is an amenable number.

279381822397 is a deficient number, since it is larger than the sum of its proper divisors (1).

279381822397 is an equidigital number, since it uses as much as digits as its factorization.

279381822397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 61.

The spelling of 279381822397 in words is "two hundred seventy-nine billion, three hundred eighty-one million, eight hundred twenty-two thousand, three hundred ninety-seven".