29680561 has 4 divisors (see below), whose sum is σ = 29844724. Its totient is φ = 29516400.

The previous prime is 29680529. The next prime is 29680571. The reversal of 29680561 is 16508692.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8520561 + 21160000 = 2919^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 29680561 - 2⁵ = 29680529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29680561.

It is not an unprimeable number, because it can be changed into a prime (29680501) 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 3 ways as a sum of consecutive naturals, for example, 81810 + ... + 82171.

It is an arithmetic number, because the mean of its divisors is an integer number (7461181).

Almost surely, 2^29680561 is an apocalyptic number.

It is an amenable number.

29680561 is a deficient number, since it is larger than the sum of its proper divisors (164163).

29680561 is a wasteful number, since it uses less digits than its factorization.

29680561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164162.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 29680561 is about 5447.9868759020. The cubic root of 29680561 is about 309.6164559410.

The spelling of 29680561 in words is "twenty-nine million, six hundred eighty thousand, five hundred sixty-one".