163940279 has 2 divisors, whose sum is σ = 163940280. Its totient is φ = 163940278.

The previous prime is 163940269. The next prime is 163940281. The reversal of 163940279 is 972049361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163940279 - 2¹⁶ = 163874743 is a prime.

Together with 163940281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163940269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81970139 + 81970140.

It is an arithmetic number, because the mean of its divisors is an integer number (81970140).

Almost surely, 2^163940279 is an apocalyptic number.

163940279 is a deficient number, since it is larger than the sum of its proper divisors (1).

163940279 is an equidigital number, since it uses as much as digits as its factorization.

163940279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 163940279 is about 12803.9165492438. The cubic root of 163940279 is about 547.3039173284.

The spelling of 163940279 in words is "one hundred sixty-three million, nine hundred forty thousand, two hundred seventy-nine".