231171382906 has 4 divisors (see below), whose sum is σ = 346757074362. Its totient is φ = 115585691452.

The previous prime is 231171382753. The next prime is 231171382907. The reversal of 231171382906 is 609283171132.

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., 230055488881 + 1115894025 = 479641^2 + 33405^2 .

It is not an unprimeable number, because it can be changed into a prime (231171382907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57792845725 + ... + 57792845728.

Almost surely, 2^231171382906 is an apocalyptic number.

231171382906 is a deficient number, since it is larger than the sum of its proper divisors (115585691456).

231171382906 is a wasteful number, since it uses less digits than its factorization.

231171382906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115585691455.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 231171382906 in words is "two hundred thirty-one billion, one hundred seventy-one million, three hundred eighty-two thousand, nine hundred six".