279914981 has 2 divisors, whose sum is σ = 279914982. Its totient is φ = 279914980.

The previous prime is 279914977. The next prime is 279915001. The reversal of 279914981 is 189419972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268632100 + 11282881 = 16390^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 279914981 - 2² = 279914977 is a prime.

It is a super-2 number, since 2×279914981² = 156704793176460722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279914941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139957490 + 139957491.

It is an arithmetic number, because the mean of its divisors is an integer number (139957491).

Almost surely, 2^279914981 is an apocalyptic number.

It is an amenable number.

279914981 is a deficient number, since it is larger than the sum of its proper divisors (1).

279914981 is an equidigital number, since it uses as much as digits as its factorization.

279914981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 50.

The square root of 279914981 is about 16730.6599092803. The cubic root of 279914981 is about 654.1470403856.

The spelling of 279914981 in words is "two hundred seventy-nine million, nine hundred fourteen thousand, nine hundred eighty-one".