231001405 has 12 divisors (see below), whose sum is σ = 279208692. Its totient is φ = 183472640.

The previous prime is 231001403. The next prime is 231001483. The reversal of 231001405 is 504100132.

It can be written as a sum of positive squares in 6 ways, for example, as 66879684 + 164121721 = 8178^2 + 12811^2 .

It is not a de Polignac number, because 231001405 - 2¹ = 231001403 is a prime.

It is a super-2 number, since 2×231001405² = 106723298223948050, 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 (231001403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109965 + ... + 112045.

It is an arithmetic number, because the mean of its divisors is an integer number (23267391).

Almost surely, 2^231001405 is an apocalyptic number.

It is an amenable number.

231001405 is a deficient number, since it is larger than the sum of its proper divisors (48207287).

231001405 is an equidigital number, since it uses as much as digits as its factorization.

231001405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2235 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 231001405 is about 15198.7303746070. The cubic root of 231001405 is about 613.5804879447.

Adding to 231001405 its reverse (504100132), we get a palindrome (735101537).

The spelling of 231001405 in words is "two hundred thirty-one million, one thousand, four hundred five".