161197279 has 2 divisors, whose sum is σ = 161197280. Its totient is φ = 161197278.

The previous prime is 161197277. The next prime is 161197291. The reversal of 161197279 is 972791161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161197279 - 2¹ = 161197277 is a prime.

Together with 161197277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161197277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80598639 + 80598640.

It is an arithmetic number, because the mean of its divisors is an integer number (80598640).

Almost surely, 2^161197279 is an apocalyptic number.

161197279 is a deficient number, since it is larger than the sum of its proper divisors (1).

161197279 is an equidigital number, since it uses as much as digits as its factorization.

161197279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 43.

The square root of 161197279 is about 12696.3490421459. The cubic root of 161197279 is about 544.2342909762.

The spelling of 161197279 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, two hundred seventy-nine".