231971091798 has 16 divisors (see below), whose sum is σ = 464007530160. Its totient is φ = 77312806176.

The previous prime is 231971091769. The next prime is 231971091811. The reversal of 231971091798 is 897190179132.

231971091798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231971091798² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676565 + ... + 2761872.

It is an arithmetic number, because the mean of its divisors is an integer number (29000470635).

Almost surely, 2^231971091798 is an apocalyptic number.

231971091798 is an abundant number, since it is smaller than the sum of its proper divisors (232036438362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231971091798 is a wasteful number, since it uses less digits than its factorization.

231971091798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5445551.

The product of its (nonzero) digits is 1714608, while the sum is 57.

The spelling of 231971091798 in words is "two hundred thirty-one billion, nine hundred seventy-one million, ninety-one thousand, seven hundred ninety-eight".