581404161 has 64 divisors (see below), whose sum is σ = 915425280. Its totient is φ = 325140480.

The previous prime is 581404157. The next prime is 581404169. The reversal of 581404161 is 161404185.

It is not a de Polignac number, because 581404161 - 2² = 581404157 is a prime.

It is a super-2 number, since 2×581404161² = 676061596856227842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (581404169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2262145 + ... + 2262401.

It is an arithmetic number, because the mean of its divisors is an integer number (14303520).

Almost surely, 2^581404161 is an apocalyptic number.

It is an amenable number.

581404161 is a deficient number, since it is larger than the sum of its proper divisors (334021119).

581404161 is a wasteful number, since it uses less digits than its factorization.

581404161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 581404161 is about 24112.3238407251. The cubic root of 581404161 is about 834.6275418243.

The spelling of 581404161 in words is "five hundred eighty-one million, four hundred four thousand, one hundred sixty-one".