1345121543 has 2 divisors, whose sum is σ = 1345121544. Its totient is φ = 1345121542.

The previous prime is 1345121513. The next prime is 1345121551. The reversal of 1345121543 is 3451215431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1345121543 - 2¹² = 1345117447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345121513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672560771 + 672560772.

It is an arithmetic number, because the mean of its divisors is an integer number (672560772).

Almost surely, 2^1345121543 is an apocalyptic number.

1345121543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345121543 is an equidigital number, since it uses as much as digits as its factorization.

1345121543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 1345121543 is about 36675.8986665630. The cubic root of 1345121543 is about 1103.8765546594.

Adding to 1345121543 its reverse (3451215431), we get a palindrome (4796336974).

The spelling of 1345121543 in words is "one billion, three hundred forty-five million, one hundred twenty-one thousand, five hundred forty-three".