1161909860 has 48 divisors (see below), whose sum is σ = 2549304576. Its totient is φ = 443997312.

The previous prime is 1161909841. The next prime is 1161909893. The reversal of 1161909860 is 689091611.

It is a happy 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, 708962 + ... + 710598.

It is an arithmetic number, because the mean of its divisors is an integer number (53110512).

Almost surely, 2^1161909860 is an apocalyptic number.

1161909860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161909860 is an abundant number, since it is smaller than the sum of its proper divisors (1387394716).

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

1161909860 is a wasteful number, since it uses less digits than its factorization.

1161909860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212 (or 3210 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 1161909860 is about 34086.7989110154. The cubic root of 1161909860 is about 1051.2939029935.

The spelling of 1161909860 in words is "one billion, one hundred sixty-one million, nine hundred nine thousand, eight hundred sixty".