56217551 has 8 divisors (see below), whose sum is σ = 60950400. Its totient is φ = 51543072.

The previous prime is 56217529. The next prime is 56217563. The reversal of 56217551 is 15571265.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56217551 - 2¹⁰ = 56216527 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56217571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12575 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (7618800).

Almost surely, 2^56217551 is an apocalyptic number.

56217551 is a deficient number, since it is larger than the sum of its proper divisors (4732849).

56217551 is a wasteful number, since it uses less digits than its factorization.

56217551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29185.

The product of its digits is 10500, while the sum is 32.

The square root of 56217551 is about 7497.8364212618. The cubic root of 56217551 is about 383.0810250626.

The spelling of 56217551 in words is "fifty-six million, two hundred seventeen thousand, five hundred fifty-one".