231111413 has 16 divisors (see below), whose sum is σ = 264153456. Its totient is φ = 200309760.

The previous prime is 231111409. The next prime is 231111427. The reversal of 231111413 is 314111132.

It can be written as a sum of positive squares in 8 ways, for example, as 10609 + 231100804 = 103^2 + 15202^2 .

It is a cyclic number.

It is not a de Polignac number, because 231111413 - 2² = 231111409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231111391 and 231111400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231113413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118595 + ... + 120527.

It is an arithmetic number, because the mean of its divisors is an integer number (16509591).

Almost surely, 2^231111413 is an apocalyptic number.

It is an amenable number.

231111413 is a deficient number, since it is larger than the sum of its proper divisors (33042043).

231111413 is a wasteful number, since it uses less digits than its factorization.

231111413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504.

The product of its digits is 72, while the sum is 17.

The square root of 231111413 is about 15202.3489303463. The cubic root of 231111413 is about 613.6778727064.

Adding to 231111413 its reverse (314111132), we get a palindrome (545222545).

The spelling of 231111413 in words is "two hundred thirty-one million, one hundred eleven thousand, four hundred thirteen".