56821531471 has 4 divisors (see below), whose sum is σ = 57032764200. Its totient is φ = 56610298744.

The previous prime is 56821531469. The next prime is 56821531489. The reversal of 56821531471 is 17413512865.

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

It is a cyclic number.

It is not a de Polignac number, because 56821531471 - 2¹ = 56821531469 is a prime.

It is a super-3 number, since 3×56821531471³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56828531471) 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, 105615961 + ... + 105616498.

It is an arithmetic number, because the mean of its divisors is an integer number (14258191050).

Almost surely, 2^56821531471 is an apocalyptic number.

56821531471 is a deficient number, since it is larger than the sum of its proper divisors (211232729).

56821531471 is a wasteful number, since it uses less digits than its factorization.

56821531471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211232728.

The product of its digits is 201600, while the sum is 43.

The spelling of 56821531471 in words is "fifty-six billion, eight hundred twenty-one million, five hundred thirty-one thousand, four hundred seventy-one".