231143809690 has 16 divisors (see below), whose sum is σ = 419875913160. Its totient is φ = 91609289280.

The previous prime is 231143809649. The next prime is 231143809697. The reversal of 231143809690 is 96908341132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 188904106161 + 42239703529 = 434631^2 + 205523^2 .

It is a super-2 number, since 2×231143809690² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231143809690.

It is not an unprimeable number, because it can be changed into a prime (231143809697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106028181 + ... + 106030360.

Almost surely, 2^231143809690 is an apocalyptic number.

231143809690 is a deficient number, since it is larger than the sum of its proper divisors (188732103470).

231143809690 is a wasteful number, since it uses less digits than its factorization.

231143809690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212058657.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 231143809690 in words is "two hundred thirty-one billion, one hundred forty-three million, eight hundred nine thousand, six hundred ninety".