1161155412 has 60 divisors (see below), whose sum is σ = 3059499520. Its totient is φ = 383990544.

The previous prime is 1161155399. The next prime is 1161155431. The reversal of 1161155412 is 2145511611.

1161155412 is a `hidden beast` number, since 1 + 1 + 6 + 115 + 541 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27039 + ... + 55257.

Almost surely, 2^1161155412 is an apocalyptic number.

1161155412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161155412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1529749760).

1161155412 is an abundant number, since it is smaller than the sum of its proper divisors (1898344108).

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

1161155412 is a wasteful number, since it uses less digits than its factorization.

1161155412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28362 (or 28351 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 1161155412 is about 34075.7305424256. The cubic root of 1161155412 is about 1051.0663126730.

The spelling of 1161155412 in words is "one billion, one hundred sixty-one million, one hundred fifty-five thousand, four hundred twelve".