871221053 has 4 divisors (see below), whose sum is σ = 871298460. Its totient is φ = 871143648.

The previous prime is 871221031. The next prime is 871221059. The reversal of 871221053 is 350122178.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 230219929 + 641001124 = 15173^2 + 25318^2 .

It is a cyclic number.

It is not a de Polignac number, because 871221053 - 2¹⁴ = 871204669 is a prime.

It is a super-2 number, since 2×871221053² = 1518052246380857618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871221059) 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, 18200 + ... + 45537.

It is an arithmetic number, because the mean of its divisors is an integer number (217824615).

Almost surely, 2^871221053 is an apocalyptic number.

It is an amenable number.

871221053 is a deficient number, since it is larger than the sum of its proper divisors (77407).

871221053 is a wasteful number, since it uses less digits than its factorization.

871221053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77406.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 871221053 is about 29516.4539367452. The cubic root of 871221053 is about 955.0866776220.

The spelling of 871221053 in words is "eight hundred seventy-one million, two hundred twenty-one thousand, fifty-three".