56551001 has 4 divisors (see below), whose sum is σ = 60901092. Its totient is φ = 52200912.

The previous prime is 56550961. The next prime is 56551009. The reversal of 56551001 is 10015565.

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 23775376 + 32775625 = 4876^2 + 5725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56551001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56551009) 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, 2175026 + ... + 2175051.

It is an arithmetic number, because the mean of its divisors is an integer number (15225273).

Almost surely, 2^56551001 is an apocalyptic number.

It is an amenable number.

56551001 is a deficient number, since it is larger than the sum of its proper divisors (4350091).

56551001 is a wasteful number, since it uses less digits than its factorization.

56551001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350090.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 56551001 is about 7520.0399600002. The cubic root of 56551001 is about 383.8369375122.

Adding to 56551001 its reverse (10015565), we get a palindrome (66566566).

The spelling of 56551001 in words is "fifty-six million, five hundred fifty-one thousand, one".