409401561 has 8 divisors (see below), whose sum is σ = 554817664. Its totient is φ = 268459920.

The previous prime is 409401539. The next prime is 409401563. The reversal of 409401561 is 165104904.

It is a happy number.

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

It is not a de Polignac number, because 409401561 - 2⁵ = 409401529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (409401563) 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, 1118401 + ... + 1118766.

It is an arithmetic number, because the mean of its divisors is an integer number (69352208).

Almost surely, 2^409401561 is an apocalyptic number.

It is an amenable number.

409401561 is a deficient number, since it is larger than the sum of its proper divisors (145416103).

409401561 is a wasteful number, since it uses less digits than its factorization.

409401561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237231.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 409401561 is about 20233.6739372759. The cubic root of 409401561 is about 742.5342627230.

The spelling of 409401561 in words is "four hundred nine million, four hundred one thousand, five hundred sixty-one".