56121215 has 4 divisors (see below), whose sum is σ = 67345464. Its totient is φ = 44896968.

The previous prime is 56121211. The next prime is 56121229. The reversal of 56121215 is 51212165.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 56121215 - 2² = 56121211 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 (56121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5612117 + ... + 5612126.

It is an arithmetic number, because the mean of its divisors is an integer number (16836366).

Almost surely, 2^56121215 is an apocalyptic number.

56121215 is a deficient number, since it is larger than the sum of its proper divisors (11224249).

56121215 is a wasteful number, since it uses less digits than its factorization.

56121215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224248.

The product of its digits is 600, while the sum is 23.

The square root of 56121215 is about 7491.4094134549. The cubic root of 56121215 is about 382.8620804254.

The spelling of 56121215 in words is "fifty-six million, one hundred twenty-one thousand, two hundred fifteen".