161277979 has 2 divisors, whose sum is σ = 161277980. Its totient is φ = 161277978.

The previous prime is 161277971. The next prime is 161278003. The reversal of 161277979 is 979772161.

161277979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (979772161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161277979 - 2³ = 161277971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161277971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80638989 + 80638990.

It is an arithmetic number, because the mean of its divisors is an integer number (80638990).

Almost surely, 2^161277979 is an apocalyptic number.

161277979 is a deficient number, since it is larger than the sum of its proper divisors (1).

161277979 is an equidigital number, since it uses as much as digits as its factorization.

161277979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 333396, while the sum is 49.

The square root of 161277979 is about 12699.5267234649. The cubic root of 161277979 is about 544.3250956110.

The spelling of 161277979 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, nine hundred seventy-nine".