1211162180 has 12 divisors (see below), whose sum is σ = 2543440620. Its totient is φ = 484464864.

The previous prime is 1211162179. The next prime is 1211162191. The reversal of 1211162180 is 812611121.

It can be written as a sum of positive squares in 2 ways, for example, as 285542404 + 925619776 = 16898^2 + 30424^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30279035 + ... + 30279074.

It is an arithmetic number, because the mean of its divisors is an integer number (211953385).

Almost surely, 2^1211162180 is an apocalyptic number.

1211162180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211162180 is an abundant number, since it is smaller than the sum of its proper divisors (1332278440).

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

1211162180 is a wasteful number, since it uses less digits than its factorization.

1211162180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60558118 (or 60558116 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 1211162180 is about 34801.7554154959. The cubic root of 1211162180 is about 1065.9432905755.

The spelling of 1211162180 in words is "one billion, two hundred eleven million, one hundred sixty-two thousand, one hundred eighty".