1161139968 has 144 divisors (see below), whose sum is σ = 3545113600. Its totient is φ = 374492160.

The previous prime is 1161139943. The next prime is 1161139979. The reversal of 1161139968 is 8699311611.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211563 + ... + 216981.

Almost surely, 2^1161139968 is an apocalyptic number.

1161139968 is a gapful number since it is divisible by the number (18) 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 1161139968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772556800).

1161139968 is an abundant number, since it is smaller than the sum of its proper divisors (2383973632).

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

1161139968 is an equidigital number, since it uses as much as digits as its factorization.

1161139968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475 (or 5455 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1161139968 is about 34075.5039287756. The cubic root of 1161139968 is about 1051.0616527340.

The spelling of 1161139968 in words is "one billion, one hundred sixty-one million, one hundred thirty-nine thousand, nine hundred sixty-eight".