163820977 has 2 divisors, whose sum is σ = 163820978. Its totient is φ = 163820976.

The previous prime is 163820939. The next prime is 163820981. The reversal of 163820977 is 779028361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149915536 + 13905441 = 12244^2 + 3729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163820977 is a prime.

It is not a weakly prime, because it can be changed into another prime (163820777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81910488 + 81910489.

It is an arithmetic number, because the mean of its divisors is an integer number (81910489).

Almost surely, 2^163820977 is an apocalyptic number.

It is an amenable number.

163820977 is a deficient number, since it is larger than the sum of its proper divisors (1).

163820977 is an equidigital number, since it uses as much as digits as its factorization.

163820977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 163820977 is about 12799.2568924918. The cubic root of 163820977 is about 547.1711244655.

The spelling of 163820977 in words is "one hundred sixty-three million, eight hundred twenty thousand, nine hundred seventy-seven".