871220138 has 4 divisors (see below), whose sum is σ = 1306830210. Its totient is φ = 435610068.

The previous prime is 871220099. The next prime is 871220159. The reversal of 871220138 is 831022178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 657563449 + 213656689 = 25643^2 + 14617^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217805033 + ... + 217805036.

Almost surely, 2^871220138 is an apocalyptic number.

871220138 is a deficient number, since it is larger than the sum of its proper divisors (435610072).

871220138 is a wasteful number, since it uses less digits than its factorization.

871220138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435610071.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 871220138 is about 29516.4384369117. The cubic root of 871220138 is about 955.0863432619.

The spelling of 871220138 in words is "eight hundred seventy-one million, two hundred twenty thousand, one hundred thirty-eight".