405491171 has 4 divisors (see below), whose sum is σ = 405889344. Its totient is φ = 405093000.

The previous prime is 405491167. The next prime is 405491183. The reversal of 405491171 is 171194504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405491171 - 2² = 405491167 is a prime.

It is a super-3 number, since 3×405491171³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405491101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197555 + ... + 199596.

It is an arithmetic number, because the mean of its divisors is an integer number (101472336).

Almost surely, 2^405491171 is an apocalyptic number.

405491171 is a deficient number, since it is larger than the sum of its proper divisors (398173).

405491171 is a wasteful number, since it uses less digits than its factorization.

405491171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398172.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 405491171 is about 20136.8113414215. The cubic root of 405491171 is about 740.1625957540.

The spelling of 405491171 in words is "four hundred five million, four hundred ninety-one thousand, one hundred seventy-one".