850740521 has 4 divisors (see below), whose sum is σ = 855959952. Its totient is φ = 845521092.

The previous prime is 850740511. The next prime is 850740559. The reversal of 850740521 is 125047058.

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 a de Polignac number, because none of the positive numbers 2^k-850740521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (850740511) 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, 2609471 + ... + 2609796.

It is an arithmetic number, because the mean of its divisors is an integer number (213989988).

Almost surely, 2^850740521 is an apocalyptic number.

It is an amenable number.

850740521 is a deficient number, since it is larger than the sum of its proper divisors (5219431).

850740521 is a wasteful number, since it uses less digits than its factorization.

850740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219430.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 850740521 is about 29167.4565397808. The cubic root of 850740521 is about 947.5432444067.

Adding to 850740521 its reverse (125047058), we get a palindrome (975787579).

The spelling of 850740521 in words is "eight hundred fifty million, seven hundred forty thousand, five hundred twenty-one".