163574981 has 2 divisors, whose sum is σ = 163574982. Its totient is φ = 163574980.

The previous prime is 163574959. The next prime is 163575017. The reversal of 163574981 is 189475361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138274081 + 25300900 = 11759^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 163574981 - 2¹⁴ = 163558597 is a prime.

It is a super-2 number, since 2×163574981² = 53513548818300722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163574911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81787490 + 81787491.

It is an arithmetic number, because the mean of its divisors is an integer number (81787491).

Almost surely, 2^163574981 is an apocalyptic number.

It is an amenable number.

163574981 is a deficient number, since it is larger than the sum of its proper divisors (1).

163574981 is an equidigital number, since it uses as much as digits as its factorization.

163574981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 163574981 is about 12789.6435055869. The cubic root of 163574981 is about 546.8971071814.

The spelling of 163574981 in words is "one hundred sixty-three million, five hundred seventy-four thousand, nine hundred eighty-one".