851521290 has 64 divisors (see below), whose sum is σ = 2173530240. Its totient is φ = 212889600.

The previous prime is 851521289. The next prime is 851521337. The reversal of 851521290 is 92125158.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47590 + ... + 62990.

It is an arithmetic number, because the mean of its divisors is an integer number (33961410).

Almost surely, 2^851521290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851521290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086765120).

851521290 is an abundant number, since it is smaller than the sum of its proper divisors (1322008950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851521290 is a wasteful number, since it uses less digits than its factorization.

851521290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15527.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 851521290 is about 29180.8377192979. The cubic root of 851521290 is about 947.8330257470.

The spelling of 851521290 in words is "eight hundred fifty-one million, five hundred twenty-one thousand, two hundred ninety".