851581241 has 12 divisors (see below), whose sum is σ = 991745280. Its totient is φ = 729093960.

The previous prime is 851581207. The next prime is 851581249. The reversal of 851581241 is 142185158.

It is a de Polignac number, because none of the positive numbers 2^k-851581241 is a prime.

It is a super-2 number, since 2×851581241² = 1450381220046200162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851581249) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 35576 + ... + 54486.

It is an arithmetic number, because the mean of its divisors is an integer number (82645440).

Almost surely, 2^851581241 is an apocalyptic number.

It is an amenable number.

851581241 is a deficient number, since it is larger than the sum of its proper divisors (140164039).

851581241 is a wasteful number, since it uses less digits than its factorization.

851581241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19844 (or 19837 counting only the distinct ones).

The product of its digits is 12800, while the sum is 35.

The square root of 851581241 is about 29181.8649335508. The cubic root of 851581241 is about 947.8552691541.

The spelling of 851581241 in words is "eight hundred fifty-one million, five hundred eighty-one thousand, two hundred forty-one".