56100991 has 4 divisors (see below), whose sum is σ = 57617272. Its totient is φ = 54584712.

The previous prime is 56100973. The next prime is 56101021. The reversal of 56100991 is 19900165.

56100991 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.

It is a cyclic number.

It is not a de Polignac number, because 56100991 - 2⁹ = 56100479 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 (56100931) 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, 758085 + ... + 758158.

It is an arithmetic number, because the mean of its divisors is an integer number (14404318).

Almost surely, 2^56100991 is an apocalyptic number.

56100991 is a deficient number, since it is larger than the sum of its proper divisors (1516281).

56100991 is a wasteful number, since it uses less digits than its factorization.

56100991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516280.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 56100991 is about 7490.0594790696. The cubic root of 56100991 is about 382.8160851454.

The spelling of 56100991 in words is "fifty-six million, one hundred thousand, nine hundred ninety-one".