163731145 has 4 divisors (see below), whose sum is σ = 196477380. Its totient is φ = 130984912.

The previous prime is 163731133. The next prime is 163731149. The reversal of 163731145 is 541137361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121947849 + 41783296 = 11043^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 163731145 - 2⁷ = 163731017 is a prime.

It is a super-2 number, since 2×163731145² = 53615775686022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163731149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16373110 + ... + 16373119.

It is an arithmetic number, because the mean of its divisors is an integer number (49119345).

Almost surely, 2^163731145 is an apocalyptic number.

It is an amenable number.

163731145 is a deficient number, since it is larger than the sum of its proper divisors (32746235).

163731145 is an equidigital number, since it uses as much as digits as its factorization.

163731145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32746234.

The product of its digits is 7560, while the sum is 31.

The square root of 163731145 is about 12795.7471450478. The cubic root of 163731145 is about 547.0710915625.

The spelling of 163731145 in words is "one hundred sixty-three million, seven hundred thirty-one thousand, one hundred forty-five".