29166561 has 14 divisors (see below), whose sum is σ = 43730930. Its totient is φ = 19443888.

The previous prime is 29166541. The next prime is 29166569. The reversal of 29166561 is 16566192.

29166561 is a `hidden beast` number, since 2 + 91 + 6 + 6 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29160000 + 6561 = 5400^2 + 81^2 .

It is not a de Polignac number, because 29166561 - 2⁶ = 29166497 is a prime.

It is a Duffinian number.

29166561 is a modest number, since divided by 6561 gives 2916 as remainder.

It is not an unprimeable number, because it can be changed into a prime (29166569) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 19276 + ... + 20733.

Almost surely, 2^29166561 is an apocalyptic number.

It is an amenable number.

29166561 is a deficient number, since it is larger than the sum of its proper divisors (14564369).

29166561 is an frugal number, since it uses more digits than its factorization.

29166561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40027 (or 40012 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 29166561 is about 5400.6074658320. The cubic root of 29166561 is about 307.8187533460.

It can be divided in two parts, 2916 and 6561, that multiplied together give a square (19131876 = 4374²).

The spelling of 29166561 in words is "twenty-nine million, one hundred sixty-six thousand, five hundred sixty-one".