1601002161 has 24 divisors (see below), whose sum is σ = 2604176640. Its totient is φ = 939002400.

The previous prime is 1601002141. The next prime is 1601002177. The reversal of 1601002161 is 1612001061.

1601002161 is a `hidden beast` number, since 1 + 601 + 0 + 0 + 2 + 1 + 61 = 666.

It is not a de Polignac number, because 1601002161 - 2⁵ = 1601002129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1601002121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257766 + ... + 263903.

It is an arithmetic number, because the mean of its divisors is an integer number (108507360).

Almost surely, 2^1601002161 is an apocalyptic number.

1601002161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1601002161 is a deficient number, since it is larger than the sum of its proper divisors (1003174479).

1601002161 is a wasteful number, since it uses less digits than its factorization.

1601002161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521717 (or 521714 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1601002161 is about 40012.5250515385. The cubic root of 1601002161 is about 1169.8512390308.

It can be divided in two parts, 160100 and 2161, that added together give a palindrome (162261).

The spelling of 1601002161 in words is "one billion, six hundred one million, two thousand, one hundred sixty-one".