851407945 has 4 divisors (see below), whose sum is σ = 1021689540. Its totient is φ = 681126352.

The previous prime is 851407919. The next prime is 851407969. The reversal of 851407945 is 549704158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 645973056 + 205434889 = 25416^2 + 14333^2 .

It is a cyclic number.

It is not a de Polignac number, because 851407945 - 2¹¹ = 851405897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85140790 + ... + 85140799.

It is an arithmetic number, because the mean of its divisors is an integer number (255422385).

Almost surely, 2^851407945 is an apocalyptic number.

It is an amenable number.

851407945 is a deficient number, since it is larger than the sum of its proper divisors (170281595).

851407945 is a wasteful number, since it uses less digits than its factorization.

851407945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170281594.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 851407945 is about 29178.8955411270. The cubic root of 851407945 is about 947.7909689002.

The spelling of 851407945 in words is "eight hundred fifty-one million, four hundred seven thousand, nine hundred forty-five".