161004261 has 16 divisors (see below), whose sum is σ = 234400320. Its totient is φ = 97489920.

The previous prime is 161004223. The next prime is 161004269. The reversal of 161004261 is 162400161.

It is not a de Polignac number, because 161004261 - 2⁶ = 161004197 is a prime.

It is a super-2 number, since 2×161004261² = 51844744120312242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161004269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68575 + ... + 70883.

It is an arithmetic number, because the mean of its divisors is an integer number (14650020).

Almost surely, 2^161004261 is an apocalyptic number.

161004261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161004261 is a deficient number, since it is larger than the sum of its proper divisors (73396059).

161004261 is a wasteful number, since it uses less digits than its factorization.

161004261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436.

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

The square root of 161004261 is about 12688.7454462606. The cubic root of 161004261 is about 544.0169817453.

The spelling of 161004261 in words is "one hundred sixty-one million, four thousand, two hundred sixty-one".