1611131543 has 16 divisors (see below), whose sum is σ = 1942007040. Its totient is φ = 1305720000.

The previous prime is 1611131521. The next prime is 1611131549. The reversal of 1611131543 is 3451311161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1611131543 - 2¹⁶ = 1611066007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611131549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57668 + ... + 80918.

It is an arithmetic number, because the mean of its divisors is an integer number (121375440).

Almost surely, 2^1611131543 is an apocalyptic number.

1611131543 is a deficient number, since it is larger than the sum of its proper divisors (330875497).

1611131543 is a wasteful number, since it uses less digits than its factorization.

1611131543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23798.

The product of its digits is 1080, while the sum is 26.

The square root of 1611131543 is about 40138.9031115700. The cubic root of 1611131543 is about 1172.3132316626.

The spelling of 1611131543 in words is "one billion, six hundred eleven million, one hundred thirty-one thousand, five hundred forty-three".