161604201 has 16 divisors (see below), whose sum is σ = 238572288. Its totient is φ = 96478800.

The previous prime is 161604199. The next prime is 161604239. The reversal of 161604201 is 102406161.

It is not a de Polignac number, because 161604201 - 2¹ = 161604199 is a prime.

It is a super-2 number, since 2×161604201² = 52231835561696802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161604281) 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 15 ways as a sum of consecutive naturals, for example, 34335 + ... + 38756.

It is an arithmetic number, because the mean of its divisors is an integer number (14910768).

Almost surely, 2^161604201 is an apocalyptic number.

161604201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161604201 is a deficient number, since it is larger than the sum of its proper divisors (76968087).

161604201 is a wasteful number, since it uses less digits than its factorization.

161604201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73172.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 161604201 is about 12712.3640995686. The cubic root of 161604201 is about 544.6918562206.

The spelling of 161604201 in words is "one hundred sixty-one million, six hundred four thousand, two hundred one".