29121155 has 16 divisors (see below), whose sum is σ = 40029120. Its totient is φ = 19923072.

The previous prime is 29121143. The next prime is 29121173. The reversal of 29121155 is 55112192.

It is a cyclic number.

It is not a de Polignac number, because 29121155 - 2¹⁰ = 29120131 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23081 + ... + 24309.

It is an arithmetic number, because the mean of its divisors is an integer number (2501820).

Almost surely, 2^29121155 is an apocalyptic number.

29121155 is a deficient number, since it is larger than the sum of its proper divisors (10907965).

29121155 is a wasteful number, since it uses less digits than its factorization.

29121155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918.

The product of its digits is 900, while the sum is 26.

The square root of 29121155 is about 5396.4020421018. The cubic root of 29121155 is about 307.6589347378.

The spelling of 29121155 in words is "twenty-nine million, one hundred twenty-one thousand, one hundred fifty-five".