1213245243 has 24 divisors (see below), whose sum is σ = 2090855760. Its totient is φ = 693282240.

The previous prime is 1213245223. The next prime is 1213245259. The reversal of 1213245243 is 3425423121.

1213245243 is a `hidden beast` number, since 1 + 2 + 132 + 4 + 524 + 3 = 666.

It is not a de Polignac number, because 1213245243 - 2⁵ = 1213245211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1213245223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457198 + ... + 459843.

It is an arithmetic number, because the mean of its divisors is an integer number (87118990).

Almost surely, 2^1213245243 is an apocalyptic number.

1213245243 is a deficient number, since it is larger than the sum of its proper divisors (877610517).

1213245243 is an equidigital number, since it uses as much as digits as its factorization.

1213245243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917064 (or 917051 counting only the distinct ones).

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

The square root of 1213245243 is about 34831.6701149974. The cubic root of 1213245243 is about 1066.5540415050.

Adding to 1213245243 its reverse (3425423121), we get a palindrome (4638668364).

It can be divided in two parts, 12132 and 45243, that added together give a palindrome (57375).

The spelling of 1213245243 in words is "one billion, two hundred thirteen million, two hundred forty-five thousand, two hundred forty-three".