56851019 has 4 divisors (see below), whose sum is σ = 56868960. Its totient is φ = 56833080.

The previous prime is 56851001. The next prime is 56851037. The reversal of 56851019 is 91015865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91015865 = 5 ⋅18203173.

It is an interprime number because it is at equal distance from previous prime (56851001) and next prime (56851037).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56851019 is a prime.

It is a super-2 number, since 2×56851019² = 6464076722676722, which contains 22 as substring.

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 56851019.

It is not an unprimeable number, because it can be changed into a prime (56854019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2804 + ... + 11025.

It is an arithmetic number, because the mean of its divisors is an integer number (14217240).

Almost surely, 2^56851019 is an apocalyptic number.

56851019 is a deficient number, since it is larger than the sum of its proper divisors (17941).

56851019 is a wasteful number, since it uses less digits than its factorization.

56851019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 56851019 is about 7539.9614720501. The cubic root of 56851019 is about 384.5145261109.

The spelling of 56851019 in words is "fifty-six million, eight hundred fifty-one thousand, nineteen".