851593345 has 4 divisors (see below), whose sum is σ = 1021912020. Its totient is φ = 681274672.

The previous prime is 851593321. The next prime is 851593349. The reversal of 851593345 is 543395158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543395158 = 2 ⋅271697579.

It can be written as a sum of positive squares in 2 ways, for example, as 517471504 + 334121841 = 22748^2 + 18279^2 .

It is a cyclic number.

It is not a de Polignac number, because 851593345 - 2¹³ = 851585153 is a prime.

It is a super-2 number, since 2×851593345² = 1450422450496578050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (851593349) 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, 85159330 + ... + 85159339.

It is an arithmetic number, because the mean of its divisors is an integer number (255478005).

Almost surely, 2^851593345 is an apocalyptic number.

It is an amenable number.

851593345 is a deficient number, since it is larger than the sum of its proper divisors (170318675).

851593345 is a wasteful number, since it uses less digits than its factorization.

851593345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170318674.

The product of its digits is 324000, while the sum is 43.

The square root of 851593345 is about 29182.0723218897. The cubic root of 851593345 is about 947.8597599317.

The spelling of 851593345 in words is "eight hundred fifty-one million, five hundred ninety-three thousand, three hundred forty-five".