231020001 has 6 divisors (see below), whose sum is σ = 333695570. Its totient is φ = 154013328.

The previous prime is 231019991. The next prime is 231020047. The reversal of 231020001 is 100020132.

It is a happy number.

231020001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 228614400 + 2405601 = 15120^2 + 1551^2 .

It is a de Polignac number, because none of the positive numbers 2^k-231020001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 25668889 = 231020001 / (2 + 3 + 1 + 0 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231020051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12834436 + ... + 12834453.

Almost surely, 2^231020001 is an apocalyptic number.

It is an amenable number.

231020001 is a deficient number, since it is larger than the sum of its proper divisors (102675569).

231020001 is a wasteful number, since it uses less digits than its factorization.

231020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25668895 (or 25668892 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 231020001 is about 15199.3421239210. The cubic root of 231020001 is about 613.5969522552.

Adding to 231020001 its reverse (100020132), we get a palindrome (331040133).

The spelling of 231020001 in words is "two hundred thirty-one million, twenty thousand, one".