1161228636 has 60 divisors (see below), whose sum is σ = 3039930432. Its totient is φ = 386534592.

The previous prime is 1161228589. The next prime is 1161228637. The reversal of 1161228636 is 6368221611.

It is a happy number.

1161228636 is a `hidden beast` number, since 1 + 1 + 6 + 12 + 2 + 8 + 636 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1161228636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161228637) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 277536 + ... + 281688.

Almost surely, 2^1161228636 is an apocalyptic number.

It is an amenable number.

1161228636 is an abundant number, since it is smaller than the sum of its proper divisors (1878701796).

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

1161228636 is a wasteful number, since it uses less digits than its factorization.

1161228636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5032 (or 5021 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1161228636 is about 34076.8049558640. The cubic root of 1161228636 is about 1051.0884060871.

The spelling of 1161228636 in words is "one billion, one hundred sixty-one million, two hundred twenty-eight thousand, six hundred thirty-six".