56871145 has 4 divisors (see below), whose sum is σ = 68245380. Its totient is φ = 45496912.

The previous prime is 56871127. The next prime is 56871149. The reversal of 56871145 is 54117865.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38044224 + 18826921 = 6168^2 + 4339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56871145 is a prime.

It is a super-2 number, since 2×56871145² = 6468654267222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56871149) 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, 5687110 + ... + 5687119.

It is an arithmetic number, because the mean of its divisors is an integer number (17061345).

Almost surely, 2^56871145 is an apocalyptic number.

It is an amenable number.

56871145 is a deficient number, since it is larger than the sum of its proper divisors (11374235).

56871145 is a wasteful number, since it uses less digits than its factorization.

56871145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374234.

The product of its digits is 33600, while the sum is 37.

The square root of 56871145 is about 7541.2959761569. The cubic root of 56871145 is about 384.5598951384.

The spelling of 56871145 in words is "fifty-six million, eight hundred seventy-one thousand, one hundred forty-five".