163721087 has 2 divisors, whose sum is σ = 163721088. Its totient is φ = 163721086.

The previous prime is 163721059. The next prime is 163721093. The reversal of 163721087 is 780127361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163721087 - 2²⁰ = 162672511 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163721017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81860543 + 81860544.

It is an arithmetic number, because the mean of its divisors is an integer number (81860544).

Almost surely, 2^163721087 is an apocalyptic number.

163721087 is a deficient number, since it is larger than the sum of its proper divisors (1).

163721087 is an equidigital number, since it uses as much as digits as its factorization.

163721087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 163721087 is about 12795.3541178039. The cubic root of 163721087 is about 547.0598891455.

The spelling of 163721087 in words is "one hundred sixty-three million, seven hundred twenty-one thousand, eighty-seven".