2131245243 has 8 divisors (see below), whose sum is σ = 3157400400. Its totient is φ = 1420830144.

The previous prime is 2131245241. The next prime is 2131245253. The reversal of 2131245243 is 3425421312.

2131245243 is a `hidden beast` number, since 2 + 13 + 124 + 524 + 3 = 666.

It is not a de Polignac number, because 2131245243 - 2¹ = 2131245241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78935009 = 2131245243 / (2 + 1 + 3 + 1 + 2 + 4 + 5 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (2131245241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39467478 + ... + 39467531.

It is an arithmetic number, because the mean of its divisors is an integer number (394675050).

Almost surely, 2^2131245243 is an apocalyptic number.

2131245243 is a deficient number, since it is larger than the sum of its proper divisors (1026155157).

2131245243 is an equidigital number, since it uses as much as digits as its factorization.

2131245243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78935018 (or 78935012 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 2131245243 is about 46165.4117603212. The cubic root of 2131245243 is about 1286.8990363144.

Adding to 2131245243 its reverse (3425421312), we get a palindrome (5556666555).

It can be divided in two parts, 213 and 1245243, that added together give a square (1245456 = 1116²).

The spelling of 2131245243 in words is "two billion, one hundred thirty-one million, two hundred forty-five thousand, two hundred forty-three".