160821947 has 24 divisors (see below), whose sum is σ = 200425680. Its totient is φ = 127828800.

The previous prime is 160821937. The next prime is 160821949. The reversal of 160821947 is 749128061.

It is not a de Polignac number, because 160821947 - 2⁸ = 160821691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 160821947.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160821949) 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 23 ways as a sum of consecutive naturals, for example, 27197 + ... + 32577.

It is an arithmetic number, because the mean of its divisors is an integer number (8351070).

Almost surely, 2^160821947 is an apocalyptic number.

160821947 is a deficient number, since it is larger than the sum of its proper divisors (39603733).

160821947 is a wasteful number, since it uses less digits than its factorization.

160821947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435 (or 5424 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 160821947 is about 12681.5593284107. The cubic root of 160821947 is about 543.8115640515.

The spelling of 160821947 in words is "one hundred sixty million, eight hundred twenty-one thousand, nine hundred forty-seven".