409725561 has 8 divisors (see below), whose sum is σ = 624343744. Its totient is φ = 234128880.

The previous prime is 409725539. The next prime is 409725571. The reversal of 409725561 is 165527904.

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

It is not a de Polignac number, because 409725561 - 2⁵ = 409725529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409725571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9755350 + ... + 9755391.

It is an arithmetic number, because the mean of its divisors is an integer number (78042968).

Almost surely, 2^409725561 is an apocalyptic number.

It is an amenable number.

409725561 is a deficient number, since it is larger than the sum of its proper divisors (214618183).

409725561 is a wasteful number, since it uses less digits than its factorization.

409725561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19510751.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 409725561 is about 20241.6788088340. The cubic root of 409725561 is about 742.7300913720.

The spelling of 409725561 in words is "four hundred nine million, seven hundred twenty-five thousand, five hundred sixty-one".