29855661 has 16 divisors (see below), whose sum is σ = 43791168. Its totient is φ = 18091920.

The previous prime is 29855647. The next prime is 29855663. The reversal of 29855661 is 16655892.

It is not a de Polignac number, because 29855661 - 2¹⁵ = 29822893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29855663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255 + ... + 7731.

It is an arithmetic number, because the mean of its divisors is an integer number (2736948).

Almost surely, 2^29855661 is an apocalyptic number.

It is an amenable number.

29855661 is a deficient number, since it is larger than the sum of its proper divisors (13935507).

29855661 is an equidigital number, since it uses as much as digits as its factorization.

29855661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513 (or 7491 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 29855661 is about 5464.0334003372. The cubic root of 29855661 is about 310.2241216592.

It can be divided in two parts, 2985 and 5661, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 29855661 in words is "twenty-nine million, eight hundred fifty-five thousand, six hundred sixty-one".