231201031 has 4 divisors (see below), whose sum is σ = 231291864. Its totient is φ = 231110200.

The previous prime is 231201029. The next prime is 231201053. The reversal of 231201031 is 130102132.

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 231201031 - 2¹ = 231201029 is a prime.

It is a super-2 number, since 2×231201031² = 106907833470925922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201011) 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, 41485 + ... + 46726.

It is an arithmetic number, because the mean of its divisors is an integer number (57822966).

Almost surely, 2^231201031 is an apocalyptic number.

231201031 is a deficient number, since it is larger than the sum of its proper divisors (90833).

231201031 is an equidigital number, since it uses as much as digits as its factorization.

231201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90832.

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

The square root of 231201031 is about 15205.2961496973. The cubic root of 231201031 is about 613.7571843477.

Adding to 231201031 its reverse (130102132), we get a palindrome (361303163).

The spelling of 231201031 in words is "two hundred thirty-one million, two hundred one thousand, thirty-one".