5851864021 has 4 divisors (see below), whose sum is σ = 5855707872. Its totient is φ = 5848020172.

The previous prime is 5851863971. The next prime is 5851864069. The reversal of 5851864021 is 1204681585.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1204681585 = 5 ⋅240936317.

It is a cyclic number.

It is not a de Polignac number, because 5851864021 - 2¹³ = 5851855829 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5851868021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1919641 + ... + 1922686.

It is an arithmetic number, because the mean of its divisors is an integer number (1463926968).

Almost surely, 2^5851864021 is an apocalyptic number.

It is an amenable number.

5851864021 is a deficient number, since it is larger than the sum of its proper divisors (3843851).

5851864021 is a wasteful number, since it uses less digits than its factorization.

5851864021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843850.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 5851864021 is about 76497.4772198404. The cubic root of 5851864021 is about 1802.0413077195.

The spelling of 5851864021 in words is "five billion, eight hundred fifty-one million, eight hundred sixty-four thousand, twenty-one".