56780161 has 4 divisors (see below), whose sum is σ = 56863024. Its totient is φ = 56697300.

The previous prime is 56780137. The next prime is 56780201. The reversal of 56780161 is 16108765.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16108765 = 5 ⋅3221753.

It is a cyclic number.

It is not a de Polignac number, because 56780161 - 2¹⁵ = 56747393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56780111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40395 + ... + 41776.

It is an arithmetic number, because the mean of its divisors is an integer number (14215756).

Almost surely, 2^56780161 is an apocalyptic number.

It is an amenable number.

56780161 is a deficient number, since it is larger than the sum of its proper divisors (82863).

56780161 is an equidigital number, since it uses as much as digits as its factorization.

56780161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82862.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 56780161 is about 7535.2611766282. The cubic root of 56780161 is about 384.3547092292.

The spelling of 56780161 in words is "fifty-six million, seven hundred eighty thousand, one hundred sixty-one".