163691545 has 4 divisors (see below), whose sum is σ = 196429860. Its totient is φ = 130953232.

The previous prime is 163691537. The next prime is 163691551. The reversal of 163691545 is 545196361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545196361 = 9091 ⋅59971.

It can be written as a sum of positive squares in 2 ways, for example, as 28643904 + 135047641 = 5352^2 + 11621^2 .

It is a cyclic number.

It is not a de Polignac number, because 163691545 - 2³ = 163691537 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 163691498 and 163691507.

It is an unprimeable number.

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, 16369150 + ... + 16369159.

It is an arithmetic number, because the mean of its divisors is an integer number (49107465).

Almost surely, 2^163691545 is an apocalyptic number.

It is an amenable number.

163691545 is a deficient number, since it is larger than the sum of its proper divisors (32738315).

163691545 is an equidigital number, since it uses as much as digits as its factorization.

163691545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32738314.

The product of its digits is 97200, while the sum is 40.

The square root of 163691545 is about 12794.1996623470. The cubic root of 163691545 is about 547.0269831513.

The spelling of 163691545 in words is "one hundred sixty-three million, six hundred ninety-one thousand, five hundred forty-five".