2105431131 has 4 divisors (see below), whose sum is σ = 2807241512. Its totient is φ = 1403620752.

The previous prime is 2105431127. The next prime is 2105431177. The reversal of 2105431131 is 1311345012.

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

It is not a de Polignac number, because 2105431131 - 2² = 2105431127 is a prime.

It is a super-2 number, since 2×2105431131² = 8865680494767878322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2105431098 and 2105431107.

It is not an unprimeable number, because it can be changed into a prime (2105431931) 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, 350905186 + ... + 350905191.

It is an arithmetic number, because the mean of its divisors is an integer number (701810378).

Almost surely, 2^2105431131 is an apocalyptic number.

2105431131 is a deficient number, since it is larger than the sum of its proper divisors (701810381).

2105431131 is an equidigital number, since it uses as much as digits as its factorization.

2105431131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701810380.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2105431131 is about 45884.9771820800. The cubic root of 2105431131 is about 1281.6821818146.

Adding to 2105431131 its reverse (1311345012), we get a palindrome (3416776143).

The spelling of 2105431131 in words is "two billion, one hundred five million, four hundred thirty-one thousand, one hundred thirty-one".