1161573220 has 24 divisors (see below), whose sum is σ = 2446113600. Its totient is φ = 463332192.

The previous prime is 1161573211. The next prime is 1161573239. The reversal of 1161573220 is 223751611.

It is a happy number.

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, 73710 + ... + 88069.

It is an arithmetic number, because the mean of its divisors is an integer number (101921400).

Almost surely, 2^1161573220 is an apocalyptic number.

1161573220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161573220 is an abundant number, since it is smaller than the sum of its proper divisors (1284540380).

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

1161573220 is a wasteful number, since it uses less digits than its factorization.

1161573220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162147 (or 162145 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1161573220 is about 34081.8605712775. The cubic root of 1161573220 is about 1051.1923627690.

The spelling of 1161573220 in words is "one billion, one hundred sixty-one million, five hundred seventy-three thousand, two hundred twenty".