858506021137 has 4 divisors (see below), whose sum is σ = 858507879460. Its totient is φ = 858504162816.

The previous prime is 858506021119. The next prime is 858506021183. The reversal of 858506021137 is 731120605858.

It is a Cunningham number, because it is equal to 926556²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 731120605858 = 2 ⋅365560302929.

It can be written as a sum of positive squares in 2 ways, for example, as 750711342096 + 107794679041 = 866436^2 + 328321^2 .

It is a cyclic number.

It is not a de Polignac number, because 858506021137 - 2¹¹ = 858506019089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858506061137) 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, 360289 + ... + 1358977.

It is an arithmetic number, because the mean of its divisors is an integer number (214626969865).

Almost surely, 2^858506021137 is an apocalyptic number.

It is an amenable number.

858506021137 is a deficient number, since it is larger than the sum of its proper divisors (1858323).

858506021137 is an equidigital number, since it uses as much as digits as its factorization.

858506021137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858322.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 858506021137 in words is "eight hundred fifty-eight billion, five hundred six million, twenty-one thousand, one hundred thirty-seven".