1215231543 has 12 divisors (see below), whose sum is σ = 1775058480. Its totient is φ = 801050976.

The previous prime is 1215231491. The next prime is 1215231551. The reversal of 1215231543 is 3451325121.

1215231543 is a `hidden beast` number, since 121 + 523 + 15 + 4 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1215231543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215231593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 757771 + ... + 759372.

It is an arithmetic number, because the mean of its divisors is an integer number (147921540).

Almost surely, 2^1215231543 is an apocalyptic number.

1215231543 is a deficient number, since it is larger than the sum of its proper divisors (559826937).

1215231543 is a wasteful number, since it uses less digits than its factorization.

1215231543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517238 (or 1517235 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1215231543 is about 34860.1712990628. The cubic root of 1215231543 is about 1067.1357708891.

Adding to 1215231543 its reverse (3451325121), we get a palindrome (4666556664).

The spelling of 1215231543 in words is "one billion, two hundred fifteen million, two hundred thirty-one thousand, five hundred forty-three".