56821719 has 4 divisors (see below), whose sum is σ = 75762296. Its totient is φ = 37881144.

The previous prime is 56821703. The next prime is 56821741. The reversal of 56821719 is 91712865.

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

It is not a de Polignac number, because 56821719 - 2⁴ = 56821703 is a prime.

It is a super-2 number, since 2×56821719² = 6457415500229922, which contains 22 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 (56821789) 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, 9470284 + ... + 9470289.

It is an arithmetic number, because the mean of its divisors is an integer number (18940574).

Almost surely, 2^56821719 is an apocalyptic number.

56821719 is a deficient number, since it is larger than the sum of its proper divisors (18940577).

56821719 is a wasteful number, since it uses less digits than its factorization.

56821719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18940576.

The product of its digits is 30240, while the sum is 39.

The square root of 56821719 is about 7538.0182408906. The cubic root of 56821719 is about 384.4484574526.

The spelling of 56821719 in words is "fifty-six million, eight hundred twenty-one thousand, seven hundred nineteen".