409659121 has 4 divisors (see below), whose sum is σ = 409714852. Its totient is φ = 409603392.

The previous prime is 409659113. The next prime is 409659143. The reversal of 409659121 is 121956904.

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

It can be written as a sum of positive squares in 2 ways, for example, as 397444096 + 12215025 = 19936^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 409659121 - 2³ = 409659113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409609121) 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, 14796 + ... + 32221.

It is an arithmetic number, because the mean of its divisors is an integer number (102428713).

Almost surely, 2^409659121 is an apocalyptic number.

It is an amenable number.

409659121 is a deficient number, since it is larger than the sum of its proper divisors (55731).

409659121 is an equidigital number, since it uses as much as digits as its factorization.

409659121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55730.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 409659121 is about 20240.0375740758. The cubic root of 409659121 is about 742.6899428275.

It can be divided in two parts, 40965 and 9121, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 409659121 in words is "four hundred nine million, six hundred fifty-nine thousand, one hundred twenty-one".