1161994899 has 16 divisors (see below), whose sum is σ = 1709203104. Its totient is φ = 697632000.

The previous prime is 1161994861. The next prime is 1161994901. The reversal of 1161994899 is 9984991611.

It is not a de Polignac number, because 1161994899 - 2¹² = 1161990803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161994819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361752 + ... + 364949.

It is an arithmetic number, because the mean of its divisors is an integer number (106825194).

Almost surely, 2^1161994899 is an apocalyptic number.

1161994899 is a deficient number, since it is larger than the sum of its proper divisors (547208205).

1161994899 is a wasteful number, since it uses less digits than its factorization.

1161994899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726758.

The product of its digits is 1259712, while the sum is 57.

The square root of 1161994899 is about 34088.0462772509. The cubic root of 1161994899 is about 1051.3195500781.

The spelling of 1161994899 in words is "one billion, one hundred sixty-one million, nine hundred ninety-four thousand, eight hundred ninety-nine".