163211645 has 16 divisors (see below), whose sum is σ = 211293360. Its totient is φ = 120566784.

The previous prime is 163211639. The next prime is 163211651. The reversal of 163211645 is 546112361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (163211639) and next prime (163211651).

It can be written as a sum of positive squares in 8 ways, for example, as 6911641 + 156300004 = 2629^2 + 12502^2 .

It is a cyclic number.

It is not a de Polignac number, because 163211645 - 2¹⁴ = 163195261 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13610 + ... + 22619.

It is an arithmetic number, because the mean of its divisors is an integer number (13205835).

Almost surely, 2^163211645 is an apocalyptic number.

It is an amenable number.

163211645 is a deficient number, since it is larger than the sum of its proper divisors (48081715).

163211645 is a wasteful number, since it uses less digits than its factorization.

163211645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36304.

The product of its digits is 4320, while the sum is 29.

The square root of 163211645 is about 12775.4313038739. The cubic root of 163211645 is about 546.4918807582.

The spelling of 163211645 in words is "one hundred sixty-three million, two hundred eleven thousand, six hundred forty-five".