1161405612 has 36 divisors (see below), whose sum is σ = 2949708216. Its totient is φ = 385297920.

The previous prime is 1161405599. The next prime is 1161405667. The reversal of 1161405612 is 2165041611.

1161405612 is a `hidden beast` number, since 1 + 1 + 6 + 1 + 40 + 5 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68853 + ... + 84044.

Almost surely, 2^1161405612 is an apocalyptic number.

1161405612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1161405612 is an abundant number, since it is smaller than the sum of its proper divisors (1788302604).

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

1161405612 is a wasteful number, since it uses less digits than its factorization.

1161405612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153118 (or 153113 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1161405612 is about 34079.4015792531. The cubic root of 1161405612 is about 1051.1418001006.

The spelling of 1161405612 in words is "one billion, one hundred sixty-one million, four hundred five thousand, six hundred twelve".