56121005 has 16 divisors (see below), whose sum is σ = 71221248. Its totient is φ = 42384000.

The previous prime is 56121001. The next prime is 56121007. The reversal of 56121005 is 50012165.

It is not a de Polignac number, because 56121005 - 2² = 56121001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56121001) 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, 1940 + ... + 10770.

It is an arithmetic number, because the mean of its divisors is an integer number (4451328).

Almost surely, 2^56121005 is an apocalyptic number.

It is an amenable number.

56121005 is a deficient number, since it is larger than the sum of its proper divisors (15100243).

56121005 is a wasteful number, since it uses less digits than its factorization.

56121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8908.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 56121005 is about 7491.3953973876. The cubic root of 56121005 is about 382.8616028809.

The spelling of 56121005 in words is "fifty-six million, one hundred twenty-one thousand, five".