279117481 has 2 divisors, whose sum is σ = 279117482. Its totient is φ = 279117480.

The previous prime is 279117427. The next prime is 279117497. The reversal of 279117481 is 184711972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256640400 + 22477081 = 16020^2 + 4741^2 .

It is a cyclic number.

It is not a de Polignac number, because 279117481 - 2¹⁹ = 278593193 is a prime.

It is a super-2 number, since 2×279117481² = 155813136399570722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (279717481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139558740 + 139558741.

It is an arithmetic number, because the mean of its divisors is an integer number (139558741).

Almost surely, 2^279117481 is an apocalyptic number.

It is an amenable number.

279117481 is a deficient number, since it is larger than the sum of its proper divisors (1).

279117481 is an equidigital number, since it uses as much as digits as its factorization.

279117481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 279117481 is about 16706.8094201137. The cubic root of 279117481 is about 653.5252105159.

The spelling of 279117481 in words is "two hundred seventy-nine million, one hundred seventeen thousand, four hundred eighty-one".