56151321 has 4 divisors (see below), whose sum is σ = 74868432. Its totient is φ = 37434212.

The previous prime is 56151317. The next prime is 56151331. The reversal of 56151321 is 12315165.

56151321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 56151321 - 2² = 56151317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56151291 and 56151300.

It is not an unprimeable number, because it can be changed into a prime (56151331) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9358551 + ... + 9358556.

It is an arithmetic number, because the mean of its divisors is an integer number (18717108).

Almost surely, 2^56151321 is an apocalyptic number.

It is an amenable number.

56151321 is a deficient number, since it is larger than the sum of its proper divisors (18717111).

56151321 is a wasteful number, since it uses less digits than its factorization.

56151321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18717110.

The product of its digits is 900, while the sum is 24.

The square root of 56151321 is about 7493.4185122679. The cubic root of 56151321 is about 382.9305297946.

Adding to 56151321 its reverse (12315165), we get a palindrome (68466486).

The spelling of 56151321 in words is "fifty-six million, one hundred fifty-one thousand, three hundred twenty-one".