231020401 has 4 divisors (see below), whose sum is σ = 238472704. Its totient is φ = 223568100.

The previous prime is 231020371. The next prime is 231020417. The reversal of 231020401 is 104020132.

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 a cyclic number.

It is not a de Polignac number, because 231020401 - 2²³ = 222631793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231020501) 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, 3726105 + ... + 3726166.

It is an arithmetic number, because the mean of its divisors is an integer number (59618176).

Almost surely, 2^231020401 is an apocalyptic number.

It is an amenable number.

231020401 is a deficient number, since it is larger than the sum of its proper divisors (7452303).

231020401 is an equidigital number, since it uses as much as digits as its factorization.

231020401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7452302.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 231020401 is about 15199.3552823796. The cubic root of 231020401 is about 613.5973063929.

Adding to 231020401 its reverse (104020132), we get a palindrome (335040533).

The spelling of 231020401 in words is "two hundred thirty-one million, twenty thousand, four hundred one".