2143523431 has 4 divisors (see below), whose sum is σ = 2449741072. Its totient is φ = 1837305792.

The previous prime is 2143523413. The next prime is 2143523443. The reversal of 2143523431 is 1343253412.

It is a happy number.

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

It is not a de Polignac number, because 2143523431 - 2¹⁵ = 2143490663 is a prime.

It is a super-4 number, since 4×2143523431⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2143523431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143523401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153108810 + ... + 153108823.

It is an arithmetic number, because the mean of its divisors is an integer number (612435268).

Almost surely, 2^2143523431 is an apocalyptic number.

2143523431 is a deficient number, since it is larger than the sum of its proper divisors (306217641).

2143523431 is an equidigital number, since it uses as much as digits as its factorization.

2143523431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306217640.

The product of its digits is 8640, while the sum is 28.

The square root of 2143523431 is about 46298.2011637601. The cubic root of 2143523431 is about 1289.3655977628.

Adding to 2143523431 its reverse (1343253412), we get a palindrome (3486776843).

The spelling of 2143523431 in words is "two billion, one hundred forty-three million, five hundred twenty-three thousand, four hundred thirty-one".