1161565542 has 32 divisors (see below), whose sum is σ = 2585288160. Its totient is φ = 386583840.

The previous prime is 1161565541. The next prime is 1161565553. The reversal of 1161565542 is 2455651611.

1161565542 is a `hidden beast` number, since 1 + 1 + 61 + 56 + 5 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1161565497 and 1161565506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161565541) 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, 18792 + ... + 51732.

It is an arithmetic number, because the mean of its divisors is an integer number (80790255).

Almost surely, 2^1161565542 is an apocalyptic number.

1161565542 is an abundant number, since it is smaller than the sum of its proper divisors (1423722618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161565542 is a wasteful number, since it uses less digits than its factorization.

1161565542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33605 (or 33599 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 1161565542 is about 34081.7479305273. The cubic root of 1161565542 is about 1051.1900466364.

The spelling of 1161565542 in words is "one billion, one hundred sixty-one million, five hundred sixty-five thousand, five hundred forty-two".