851499749 has 4 divisors (see below), whose sum is σ = 867565836. Its totient is φ = 835433664.

The previous prime is 851499743. The next prime is 851499751. The reversal of 851499749 is 947994158.

851499749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947994158 = 2 ⋅473997079.

It can be written as a sum of positive squares in 2 ways, for example, as 505800100 + 345699649 = 22490^2 + 18593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851499749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851499694 and 851499703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851499743) 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, 8032964 + ... + 8033069.

It is an arithmetic number, because the mean of its divisors is an integer number (216891459).

Almost surely, 2^851499749 is an apocalyptic number.

It is an amenable number.

851499749 is a deficient number, since it is larger than the sum of its proper divisors (16066087).

851499749 is a wasteful number, since it uses less digits than its factorization.

851499749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16066086.

The product of its digits is 3265920, while the sum is 56.

The square root of 851499749 is about 29180.4686220081. The cubic root of 851499749 is about 947.8250332111.

The spelling of 851499749 in words is "eight hundred fifty-one million, four hundred ninety-nine thousand, seven hundred forty-nine".