851993953 has 4 divisors (see below), whose sum is σ = 896835760. Its totient is φ = 807152148.

The previous prime is 851993951. The next prime is 851993963. The reversal of 851993953 is 359399158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 851993953 - 2¹ = 851993951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851993953.

It is not an unprimeable number, because it can be changed into a prime (851993951) 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 3 ways as a sum of consecutive naturals, for example, 22420875 + ... + 22420912.

It is an arithmetic number, because the mean of its divisors is an integer number (224208940).

Almost surely, 2^851993953 is an apocalyptic number.

It is an amenable number.

851993953 is a deficient number, since it is larger than the sum of its proper divisors (44841807).

851993953 is a wasteful number, since it uses less digits than its factorization.

851993953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44841806.

The product of its digits is 1312200, while the sum is 52.

The square root of 851993953 is about 29188.9354550658. The cubic root of 851993953 is about 948.0083679019.

The spelling of 851993953 in words is "eight hundred fifty-one million, nine hundred ninety-three thousand, nine hundred fifty-three".