231320011 has 4 divisors (see below), whose sum is σ = 249113872. Its totient is φ = 213526152.

The previous prime is 231320009. The next prime is 231320021. The reversal of 231320011 is 110023132.

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 231320011 - 2¹ = 231320009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 17793847 = 231320011 / (2 + 3 + 1 + 3 + 2 + 0 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231319973 and 231320000.

It is not an unprimeable number, because it can be changed into a prime (231320021) 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, 8896911 + ... + 8896936.

It is an arithmetic number, because the mean of its divisors is an integer number (62278468).

Almost surely, 2^231320011 is an apocalyptic number.

231320011 is a deficient number, since it is larger than the sum of its proper divisors (17793861).

231320011 is a wasteful number, since it uses less digits than its factorization.

231320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17793860.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 231320011 is about 15209.2080990432. The cubic root of 231320011 is about 613.8624496031.

Adding to 231320011 its reverse (110023132), we get a palindrome (341343143).

The spelling of 231320011 in words is "two hundred thirty-one million, three hundred twenty thousand, eleven".