56721849 has 4 divisors (see below), whose sum is σ = 75629136. Its totient is φ = 37814564.

The previous prime is 56721839. The next prime is 56721853. The reversal of 56721849 is 94812765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56721849 - 2¹⁷ = 56590777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56721849.

It is not an unprimeable number, because it can be changed into a prime (56721839) 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, 9453639 + ... + 9453644.

It is an arithmetic number, because the mean of its divisors is an integer number (18907284).

Almost surely, 2^56721849 is an apocalyptic number.

It is an amenable number.

56721849 is a deficient number, since it is larger than the sum of its proper divisors (18907287).

56721849 is a wasteful number, since it uses less digits than its factorization.

56721849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18907286.

The product of its digits is 120960, while the sum is 42.

The square root of 56721849 is about 7531.3909073955. The cubic root of 56721849 is about 384.2230894981.

The spelling of 56721849 in words is "fifty-six million, seven hundred twenty-one thousand, eight hundred forty-nine".