403161561 has 24 divisors (see below), whose sum is σ = 636636000. Its totient is φ = 243820800.

The previous prime is 403161559. The next prime is 403161571. The reversal of 403161561 is 165161304.

403161561 is a `hidden beast` number, since 40 + 3 + 1 + 61 + 561 = 666.

It is not a de Polignac number, because 403161561 - 2¹ = 403161559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (403161571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45321 + ... + 53481.

It is an arithmetic number, because the mean of its divisors is an integer number (26526500).

Almost surely, 2^403161561 is an apocalyptic number.

It is an amenable number.

403161561 is a deficient number, since it is larger than the sum of its proper divisors (233474439).

403161561 is a wasteful number, since it uses less digits than its factorization.

403161561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8677 (or 8674 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 403161561 is about 20078.8834599935. The cubic root of 403161561 is about 738.7424227280.

The spelling of 403161561 in words is "four hundred three million, one hundred sixty-one thousand, five hundred sixty-one".