56821129 has 4 divisors (see below), whose sum is σ = 57047760. Its totient is φ = 56594500.

The previous prime is 56821117. The next prime is 56821133. The reversal of 56821129 is 92112865.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56821129 - 2⁵ = 56821097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56821094 and 56821103.

It is not an unprimeable number, because it can be changed into a prime (56821169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112939 + ... + 113440.

It is an arithmetic number, because the mean of its divisors is an integer number (14261940).

Almost surely, 2^56821129 is an apocalyptic number.

It is an amenable number.

56821129 is a deficient number, since it is larger than the sum of its proper divisors (226631).

56821129 is a wasteful number, since it uses less digits than its factorization.

56821129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226630.

The product of its digits is 8640, while the sum is 34.

The square root of 56821129 is about 7537.9791058347. The cubic root of 56821129 is about 384.4471268265.

The spelling of 56821129 in words is "fifty-six million, eight hundred twenty-one thousand, one hundred twenty-nine".