8505821437 has 4 divisors (see below), whose sum is σ = 8507356000. Its totient is φ = 8504286876.

The previous prime is 8505821417. The next prime is 8505821461. The reversal of 8505821437 is 7341285058.

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 8505821437 - 2²³ = 8497432829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8505821393 and 8505821402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8505821407) 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, 758937 + ... + 770062.

It is an arithmetic number, because the mean of its divisors is an integer number (2126839000).

Almost surely, 2^8505821437 is an apocalyptic number.

It is an amenable number.

8505821437 is a deficient number, since it is larger than the sum of its proper divisors (1534563).

8505821437 is a wasteful number, since it uses less digits than its factorization.

8505821437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534562.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 8505821437 is about 92227.0103440418. The cubic root of 8505821437 is about 2041.2933485201.

The spelling of 8505821437 in words is "eight billion, five hundred five million, eight hundred twenty-one thousand, four hundred thirty-seven".