1161691644 has 24 divisors (see below), whose sum is σ = 2798053888. Its totient is φ = 374739120.

The previous prime is 1161691631. The next prime is 1161691649. The reversal of 1161691644 is 4461961611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161691649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561042 + ... + 1561785.

Almost surely, 2^1161691644 is an apocalyptic number.

It is an amenable number.

1161691644 is an abundant number, since it is smaller than the sum of its proper divisors (1636362244).

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

1161691644 is a wasteful number, since it uses less digits than its factorization.

1161691644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122865 (or 3122863 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 1161691644 is about 34083.5978734640. The cubic root of 1161691644 is about 1051.2280850613.

The spelling of 1161691644 in words is "one billion, one hundred sixty-one million, six hundred ninety-one thousand, six hundred forty-four".