231500001 has 4 divisors (see below), whose sum is σ = 308666672. Its totient is φ = 154333332.

The previous prime is 231499969. The next prime is 231500023. The reversal of 231500001 is 100005132.

231500001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231500001 - 2⁵ = 231499969 is a prime.

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 231500001.

It is not an unprimeable number, because it can be changed into a prime (231500041) 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, 38583331 + ... + 38583336.

It is an arithmetic number, because the mean of its divisors is an integer number (77166668).

Almost surely, 2^231500001 is an apocalyptic number.

It is an amenable number.

231500001 is a deficient number, since it is larger than the sum of its proper divisors (77166671).

231500001 is an equidigital number, since it uses as much as digits as its factorization.

231500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77166670.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 231500001 is about 15215.1240875650. The cubic root of 231500001 is about 614.0216236942.

Adding to 231500001 its reverse (100005132), we get a palindrome (331505133).

The spelling of 231500001 in words is "two hundred thirty-one million, five hundred thousand, one".