1161125220 has 24 divisors (see below), whose sum is σ = 3251150784. Its totient is φ = 309633376.

The previous prime is 1161125183. The next prime is 1161125281. The reversal of 1161125220 is 225211611.

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, 9675984 + ... + 9676103.

It is an arithmetic number, because the mean of its divisors is an integer number (135464616).

Almost surely, 2^1161125220 is an apocalyptic number.

1161125220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161125220 is an abundant number, since it is smaller than the sum of its proper divisors (2090025564).

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

1161125220 is a wasteful number, since it uses less digits than its factorization.

1161125220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19352099 (or 19352097 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1161125220 is about 34075.2875262998. The cubic root of 1161125220 is about 1051.0572027615.

Adding to 1161125220 its reverse (225211611), we get a palindrome (1386336831).

The spelling of 1161125220 in words is "one billion, one hundred sixty-one million, one hundred twenty-five thousand, two hundred twenty".