56821431 has 8 divisors (see below), whose sum is σ = 79056000. Its totient is φ = 36233912.

The previous prime is 56821421. The next prime is 56821433. The reversal of 56821431 is 13412865.

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 56821431 - 2¹⁸ = 56559287 is a prime.

It is a super-2 number, since 2×56821431² = 6457350041775522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56821433) 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, 411681 + ... + 411818.

It is an arithmetic number, because the mean of its divisors is an integer number (9882000).

Almost surely, 2^56821431 is an apocalyptic number.

56821431 is a deficient number, since it is larger than the sum of its proper divisors (22234569).

56821431 is a wasteful number, since it uses less digits than its factorization.

56821431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823525.

The product of its digits is 5760, while the sum is 30.

The square root of 56821431 is about 7537.9991377023. Note that the first 3 decimals coincide. The cubic root of 56821431 is about 384.4478079278.

The spelling of 56821431 in words is "fifty-six million, eight hundred twenty-one thousand, four hundred thirty-one".