409551 has 8 divisors (see below), whose sum is σ = 549504. Its totient is φ = 271320.

The previous prime is 409543. The next prime is 409573. The reversal of 409551 is 155904.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 409551 - 2³ = 409543 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

409551 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310 + ... + 956.

It is an arithmetic number, because the mean of its divisors is an integer number (68688).

2⁴⁰⁹⁵⁵¹ is an apocalyptic number.

409551 is a deficient number, since it is larger than the sum of its proper divisors (139953).

409551 is a wasteful number, since it uses less digits than its factorization.

409551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 409551 is about 639.9617176050. The cubic root of 409551 is about 74.2624597893.

It can be divided in two parts, 40 and 9551, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 409551 in words is "four hundred nine thousand, five hundred fifty-one".