1161537543 has 64 divisors (see below), whose sum is σ = 1851801600. Its totient is φ = 718230240.

The previous prime is 1161537541. The next prime is 1161537547. The reversal of 1161537543 is 3457351611.

1161537543 is a `hidden beast` number, since 1 + 1 + 61 + 53 + 7 + 543 = 666.

It is not a de Polignac number, because 1161537543 - 2¹ = 1161537541 is a prime.

It is a super-3 number, since 3×1161537543³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1161537498 and 1161537507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161537541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2123196 + ... + 2123742.

It is an arithmetic number, because the mean of its divisors is an integer number (28934400).

Almost surely, 2^1161537543 is an apocalyptic number.

1161537543 is a deficient number, since it is larger than the sum of its proper divisors (690264057).

1161537543 is a wasteful number, since it uses less digits than its factorization.

1161537543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 1161537543 is about 34081.3371656688. The cubic root of 1161537543 is about 1051.1816004187.

The spelling of 1161537543 in words is "one billion, one hundred sixty-one million, five hundred thirty-seven thousand, five hundred forty-three".