161877899 has 2 divisors, whose sum is σ = 161877900. Its totient is φ = 161877898.

The previous prime is 161877857. The next prime is 161877901. The reversal of 161877899 is 998778161.

161877899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161877899 - 2²⁰ = 160829323 is a prime.

Together with 161877901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161874899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80938949 + 80938950.

It is an arithmetic number, because the mean of its divisors is an integer number (80938950).

Almost surely, 2^161877899 is an apocalyptic number.

161877899 is a deficient number, since it is larger than the sum of its proper divisors (1).

161877899 is an equidigital number, since it uses as much as digits as its factorization.

161877899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 56.

The square root of 161877899 is about 12723.1245769268. The cubic root of 161877899 is about 544.9991852525. Note that the first 3 decimals are identical.

The spelling of 161877899 in words is "one hundred sixty-one million, eight hundred seventy-seven thousand, eight hundred ninety-nine".