406041661 has 4 divisors (see below), whose sum is σ = 406082812. Its totient is φ = 406000512.

The previous prime is 406041659. The next prime is 406041667. The reversal of 406041661 is 166140604.

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 54479161 + 351562500 = 7381^2 + 18750^2 .

It is a cyclic number.

It is not a de Polignac number, because 406041661 - 2¹ = 406041659 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 (406041667) 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, 4051 + ... + 28783.

It is an arithmetic number, because the mean of its divisors is an integer number (101520703).

Almost surely, 2^406041661 is an apocalyptic number.

It is an amenable number.

406041661 is a deficient number, since it is larger than the sum of its proper divisors (41151).

406041661 is a wasteful number, since it uses less digits than its factorization.

406041661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41150.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 406041661 is about 20150.4754534477. The cubic root of 406041661 is about 740.4973896134.

The spelling of 406041661 in words is "four hundred six million, forty-one thousand, six hundred sixty-one".