2113431 has 4 divisors (see below), whose sum is σ = 2817912. Its totient is φ = 1408952.

The previous prime is 2113421. The next prime is 2113451. The reversal of 2113431 is 1343112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2113431 - 2⁵ = 2113399 is a prime.

It is a super-2 number, since 2×2113431² = 8933181183522, which contains 22 as substring.

It is a D-number.

2113431 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2113431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113421) 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, 352236 + ... + 352241.

It is an arithmetic number, because the mean of its divisors is an integer number (704478).

2^2113431 is an apocalyptic number.

2113431 is a deficient number, since it is larger than the sum of its proper divisors (704481).

2113431 is an equidigital number, since it uses as much as digits as its factorization.

2113431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704480.

The product of its digits is 72, while the sum is 15.

The square root of 2113431 is about 1453.7644238321. The cubic root of 2113431 is about 128.3303438145.

Adding to 2113431 its reverse (1343112), we get a palindrome (3456543).

The spelling of 2113431 in words is "two million, one hundred thirteen thousand, four hundred thirty-one".