231623011 has 4 divisors (see below), whose sum is σ = 245247912. Its totient is φ = 217998112.

The previous prime is 231623009. The next prime is 231623017. The reversal of 231623011 is 110326132.

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

It is a cyclic number.

It is not a de Polignac number, because 231623011 - 2¹ = 231623009 is a prime.

It is a super-2 number, since 2×231623011² = 107298438449412242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231623011.

It is not an unprimeable number, because it can be changed into a prime (231623017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6812425 + ... + 6812458.

It is an arithmetic number, because the mean of its divisors is an integer number (61311978).

Almost surely, 2^231623011 is an apocalyptic number.

231623011 is a deficient number, since it is larger than the sum of its proper divisors (13624901).

231623011 is a wasteful number, since it uses less digits than its factorization.

231623011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13624900.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231623011 is about 15219.1659101279. The cubic root of 231623011 is about 614.1303600881.

Adding to 231623011 its reverse (110326132), we get a palindrome (341949143).

The spelling of 231623011 in words is "two hundred thirty-one million, six hundred twenty-three thousand, eleven".