1161212616 has 48 divisors (see below), whose sum is σ = 3204300060. Its totient is φ = 379766400.

The previous prime is 1161212603. The next prime is 1161212617. The reversal of 1161212616 is 6162121611.

1161212616 is a `hidden beast` number, since 11 + 612 + 1 + 26 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1143116100 + 18096516 = 33810^2 + 4254^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1161212616.

It is not an unprimeable number, because it can be changed into a prime (1161212617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148335 + ... + 155966.

Almost surely, 2^1161212616 is an apocalyptic number.

It is an amenable number.

1161212616 is an abundant number, since it is smaller than the sum of its proper divisors (2043087444).

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

1161212616 is a wasteful number, since it uses less digits than its factorization.

1161212616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304366 (or 304359 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1161212616 is about 34076.5698978051. The cubic root of 1161212616 is about 1051.0835725533.

The spelling of 1161212616 in words is "one billion, one hundred sixty-one million, two hundred twelve thousand, six hundred sixteen".