859711421 has 4 divisors (see below), whose sum is σ = 860924700. Its totient is φ = 858498144.

The previous prime is 859711399. The next prime is 859711423. The reversal of 859711421 is 124117958.

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

It can be written as a sum of positive squares in 2 ways, for example, as 443102500 + 416608921 = 21050^2 + 20411^2 .

It is a cyclic number.

It is not a de Polignac number, because 859711421 - 2¹⁸ = 859449277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859711423) 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, 605576 + ... + 606993.

It is an arithmetic number, because the mean of its divisors is an integer number (215231175).

Almost surely, 2^859711421 is an apocalyptic number.

It is an amenable number.

859711421 is a deficient number, since it is larger than the sum of its proper divisors (1213279).

859711421 is a wasteful number, since it uses less digits than its factorization.

859711421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213278.

The product of its digits is 20160, while the sum is 38.

The square root of 859711421 is about 29320.8359532944. The cubic root of 859711421 is about 950.8621613632.

The spelling of 859711421 in words is "eight hundred fifty-nine million, seven hundred eleven thousand, four hundred twenty-one".