1125621543 has 16 divisors (see below), whose sum is σ = 1512806400. Its totient is φ = 744438816.

The previous prime is 1125621533. The next prime is 1125621547. The reversal of 1125621543 is 3451265211.

It is not a de Polignac number, because 1125621543 - 2⁹ = 1125621031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1125621543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125621547) 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 15 ways as a sum of consecutive naturals, for example, 699646 + ... + 701252.

It is an arithmetic number, because the mean of its divisors is an integer number (94550400).

Almost surely, 2^1125621543 is an apocalyptic number.

1125621543 is a deficient number, since it is larger than the sum of its proper divisors (387184857).

1125621543 is a wasteful number, since it uses less digits than its factorization.

1125621543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326.

The product of its digits is 7200, while the sum is 30.

The square root of 1125621543 is about 33550.2837990977. The cubic root of 1125621543 is about 1040.2334113064.

Adding to 1125621543 its reverse (3451265211), we get a palindrome (4576886754).

The spelling of 1125621543 in words is "one billion, one hundred twenty-five million, six hundred twenty-one thousand, five hundred forty-three".