1161953220 has 24 divisors (see below), whose sum is σ = 3253469184. Its totient is φ = 309854176.

The previous prime is 1161953207. The next prime is 1161953249. The reversal of 1161953220 is 223591611.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9682884 + ... + 9683003.

It is an arithmetic number, because the mean of its divisors is an integer number (135561216).

Almost surely, 2^1161953220 is an apocalyptic number.

1161953220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161953220 is an abundant number, since it is smaller than the sum of its proper divisors (2091515964).

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

1161953220 is a wasteful number, since it uses less digits than its factorization.

1161953220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19365899 (or 19365897 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1161953220 is about 34087.4349284307. The cubic root of 1161953220 is about 1051.3069801803.

The spelling of 1161953220 in words is "one billion, one hundred sixty-one million, nine hundred fifty-three thousand, two hundred twenty".