231220036 has 12 divisors (see below), whose sum is σ = 406975212. Its totient is φ = 114941408.

The previous prime is 231220027. The next prime is 231220057. The reversal of 231220036 is 630022132.

It can be written as a sum of positive squares in 2 ways, for example, as 225000000 + 6220036 = 15000^2 + 2494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231219995 and 231220022.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166375 + ... + 167758.

It is an arithmetic number, because the mean of its divisors is an integer number (33914601).

Almost surely, 2^231220036 is an apocalyptic number.

It is an amenable number.

231220036 is a deficient number, since it is larger than the sum of its proper divisors (175755176).

231220036 is a wasteful number, since it uses less digits than its factorization.

231220036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334310 (or 334308 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231220036 is about 15205.9210835779. The cubic root of 231220036 is about 613.7740010773.

Adding to 231220036 its reverse (630022132), we get a palindrome (861242168).

The spelling of 231220036 in words is "two hundred thirty-one million, two hundred twenty thousand, thirty-six".