1161011992 has 16 divisors (see below), whose sum is σ = 2487882960. Its totient is φ = 497576544.

The previous prime is 1161011947. The next prime is 1161012019. The reversal of 1161011992 is 2991101611.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10366123 + ... + 10366234.

It is an arithmetic number, because the mean of its divisors is an integer number (155492685).

Almost surely, 2^1161011992 is an apocalyptic number.

It is an amenable number.

1161011992 is an abundant number, since it is smaller than the sum of its proper divisors (1326870968).

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

1161011992 is a wasteful number, since it uses less digits than its factorization.

1161011992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20732370 (or 20732366 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 31.

The square root of 1161011992 is about 34073.6260471350. The cubic root of 1161011992 is about 1051.0230367728.

The spelling of 1161011992 in words is "one billion, one hundred sixty-one million, eleven thousand, nine hundred ninety-two".