1161227772 has 192 divisors, whose sum is σ = 3370429440. Its totient is φ = 343867392.

The previous prime is 1161227759. The next prime is 1161227777. The reversal of 1161227772 is 2777221611.

1161227772 is a `hidden beast` number, since 11 + 612 + 27 + 7 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161227777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4518268 + ... + 4518524.

It is an arithmetic number, because the mean of its divisors is an integer number (17554320).

Almost surely, 2^1161227772 is an apocalyptic number.

1161227772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161227772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1685214720).

1161227772 is an abundant number, since it is smaller than the sum of its proper divisors (2209201668).

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

1161227772 is a wasteful number, since it uses less digits than its factorization.

1161227772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 409 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 1161227772 is about 34076.7922786168. The cubic root of 1161227772 is about 1051.0881454033.

The spelling of 1161227772 in words is "one billion, one hundred sixty-one million, two hundred twenty-seven thousand, seven hundred seventy-two".