163978729 has 2 divisors, whose sum is σ = 163978730. Its totient is φ = 163978728.

The previous prime is 163978693. The next prime is 163978751. The reversal of 163978729 is 927879361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160909225 + 3069504 = 12685^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 163978729 - 2¹³ = 163970537 is a prime.

It is not a weakly prime, because it can be changed into another prime (163972729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81989364 + 81989365.

It is an arithmetic number, because the mean of its divisors is an integer number (81989365).

Almost surely, 2^163978729 is an apocalyptic number.

It is an amenable number.

163978729 is a deficient number, since it is larger than the sum of its proper divisors (1).

163978729 is an equidigital number, since it uses as much as digits as its factorization.

163978729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 163978729 is about 12805.4179549127. The cubic root of 163978729 is about 547.3467015886.

The spelling of 163978729 in words is "one hundred sixty-three million, nine hundred seventy-eight thousand, seven hundred twenty-nine".