850861529 has 12 divisors (see below), whose sum is σ = 990986724. Its totient is φ = 728419104.

The previous prime is 850861513. The next prime is 850861541. The reversal of 850861529 is 925168058.

It can be written as a sum of positive squares in 2 ways, for example, as 237160000 + 613701529 = 15400^2 + 24773^2 .

It is not a de Polignac number, because 850861529 - 2⁴ = 850861513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 850861529.

It is not an unprimeable number, because it can be changed into a prime (850861549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31619 + ... + 51975.

It is an arithmetic number, because the mean of its divisors is an integer number (82582227).

Almost surely, 2^850861529 is an apocalyptic number.

It is an amenable number.

850861529 is a deficient number, since it is larger than the sum of its proper divisors (140125195).

850861529 is a wasteful number, since it uses less digits than its factorization.

850861529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21224 (or 21217 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 850861529 is about 29169.5308327028. The cubic root of 850861529 is about 947.5881679661.

The spelling of 850861529 in words is "eight hundred fifty million, eight hundred sixty-one thousand, five hundred twenty-nine".