163097981 has 8 divisors (see below), whose sum is σ = 164091744. Its totient is φ = 162107920.

The previous prime is 163097951. The next prime is 163098029. The reversal of 163097981 is 189790361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163097981 - 2⁶ = 163097917 is a prime.

It is a super-2 number, since 2×163097981² = 53201902812552722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163097951) 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 in 7 ways as a sum of consecutive naturals, for example, 153191 + ... + 154251.

It is an arithmetic number, because the mean of its divisors is an integer number (20511468).

Almost surely, 2^163097981 is an apocalyptic number.

It is an amenable number.

163097981 is a deficient number, since it is larger than the sum of its proper divisors (993763).

163097981 is a wasteful number, since it uses less digits than its factorization.

163097981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 163097981 is about 12770.9819904344. The cubic root of 163097981 is about 546.3649885085.

The spelling of 163097981 in words is "one hundred sixty-three million, ninety-seven thousand, nine hundred eighty-one".