279490681 has 2 divisors, whose sum is σ = 279490682. Its totient is φ = 279490680.

The previous prime is 279490657. The next prime is 279490709. The reversal of 279490681 is 186094972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225600400 + 53890281 = 15020^2 + 7341^2 .

It is a cyclic number.

It is not a de Polignac number, because 279490681 - 2¹¹ = 279488633 is a prime.

It is a super-2 number, since 2×279490681² = 156230081531687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (279490621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139745340 + 139745341.

It is an arithmetic number, because the mean of its divisors is an integer number (139745341).

Almost surely, 2^279490681 is an apocalyptic number.

It is an amenable number.

279490681 is a deficient number, since it is larger than the sum of its proper divisors (1).

279490681 is an equidigital number, since it uses as much as digits as its factorization.

279490681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 279490681 is about 16717.9747876350. The cubic root of 279490681 is about 653.8163507512.

The spelling of 279490681 in words is "two hundred seventy-nine million, four hundred ninety thousand, six hundred eighty-one".