1161156542 has 128 divisors (see below), whose sum is σ = 2368445184. Its totient is φ = 414056448.

The previous prime is 1161156497. The next prime is 1161156547. The reversal of 1161156542 is 2456511611.

It is a junction number, because it is equal to n+sod(n) for n = 1161156499 and 1161156508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161156547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11970638 + ... + 11970734.

It is an arithmetic number, because the mean of its divisors is an integer number (18503478).

Almost surely, 2^1161156542 is an apocalyptic number.

1161156542 is an abundant number, since it is smaller than the sum of its proper divisors (1207288642).

1161156542 is a wasteful number, since it uses less digits than its factorization.

1161156542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its digits is 7200, while the sum is 32.

The square root of 1161156542 is about 34075.7471231373. The cubic root of 1161156542 is about 1051.0666536278.

The spelling of 1161156542 in words is "one billion, one hundred sixty-one million, one hundred fifty-six thousand, five hundred forty-two".