56821731 has 8 divisors (see below), whose sum is σ = 77374464. Its totient is φ = 37075080.

The previous prime is 56821703. The next prime is 56821741. The reversal of 56821731 is 13712865.

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

It is not a de Polignac number, because 56821731 - 2¹⁹ = 56297443 is a prime.

It is a super-2 number, since 2×56821731² = 6457418227672722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56821692 and 56821701.

It is not an unprimeable number, because it can be changed into a prime (56821741) 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, 201355 + ... + 201636.

It is an arithmetic number, because the mean of its divisors is an integer number (9671808).

Almost surely, 2^56821731 is an apocalyptic number.

56821731 is a deficient number, since it is larger than the sum of its proper divisors (20552733).

56821731 is a wasteful number, since it uses less digits than its factorization.

56821731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403041.

The product of its digits is 10080, while the sum is 33.

The square root of 56821731 is about 7538.0190368558. The cubic root of 56821731 is about 384.4484845161.

The spelling of 56821731 in words is "fifty-six million, eight hundred twenty-one thousand, seven hundred thirty-one".