56780191 has 16 divisors (see below), whose sum is σ = 62512128. Its totient is φ = 51256800.

The previous prime is 56780137. The next prime is 56780201. The reversal of 56780191 is 19108765.

56780191 = 316² + 317² + ... + 586².

It is a cyclic number.

It is not a de Polignac number, because 56780191 - 2⁷ = 56780063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56780191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56780111) 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, 209386 + ... + 209656.

It is an arithmetic number, because the mean of its divisors is an integer number (3907008).

Almost surely, 2^56780191 is an apocalyptic number.

56780191 is a deficient number, since it is larger than the sum of its proper divisors (5731937).

56780191 is a wasteful number, since it uses less digits than its factorization.

56780191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 56780191 is about 7535.2631672689. The cubic root of 56780191 is about 384.3547769209.

The spelling of 56780191 in words is "fifty-six million, seven hundred eighty thousand, one hundred ninety-one".