56147891 has 2 divisors, whose sum is σ = 56147892. Its totient is φ = 56147890.

The previous prime is 56147887. The next prime is 56147893. The reversal of 56147891 is 19874165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56147891 - 2² = 56147887 is a prime.

Together with 56147893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56147893) 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 as a sum of consecutive naturals, namely, 28073945 + 28073946.

It is an arithmetic number, because the mean of its divisors is an integer number (28073946).

Almost surely, 2^56147891 is an apocalyptic number.

56147891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56147891 is an equidigital number, since it uses as much as digits as its factorization.

56147891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 56147891 is about 7493.1896412676. The cubic root of 56147891 is about 382.9227325399.

The spelling of 56147891 in words is "fifty-six million, one hundred forty-seven thousand, eight hundred ninety-one".