872091853 has 4 divisors (see below), whose sum is σ = 893362428. Its totient is φ = 850821280.

The previous prime is 872091797. The next prime is 872091859. The reversal of 872091853 is 358190278.

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 122810724 + 749281129 = 11082^2 + 27373^2 .

It is a cyclic number.

It is not a de Polignac number, because 872091853 - 2²¹ = 869994701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872091859) by changing a digit.

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, 10635226 + ... + 10635307.

It is an arithmetic number, because the mean of its divisors is an integer number (223340607).

Almost surely, 2^872091853 is an apocalyptic number.

It is an amenable number.

872091853 is a deficient number, since it is larger than the sum of its proper divisors (21270575).

872091853 is a wasteful number, since it uses less digits than its factorization.

872091853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21270574.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 872091853 is about 29531.2013470499. The cubic root of 872091853 is about 955.4047800270.

The spelling of 872091853 in words is "eight hundred seventy-two million, ninety-one thousand, eight hundred fifty-three".