409534861 has 4 divisors (see below), whose sum is σ = 409578652. Its totient is φ = 409491072.

The previous prime is 409534843. The next prime is 409534877. The reversal of 409534861 is 168435904.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 396248836 + 13286025 = 19906^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 409534861 - 2¹¹ = 409532813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409534841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1590 + ... + 28663.

It is an arithmetic number, because the mean of its divisors is an integer number (102394663).

Almost surely, 2^409534861 is an apocalyptic number.

It is an amenable number.

409534861 is a deficient number, since it is larger than the sum of its proper divisors (43791).

409534861 is a wasteful number, since it uses less digits than its factorization.

409534861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43790.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 409534861 is about 20236.9676829312. The cubic root of 409534861 is about 742.6148430025.

The spelling of 409534861 in words is "four hundred nine million, five hundred thirty-four thousand, eight hundred sixty-one".