1321181199 has 20 divisors (see below), whose sum is σ = 2125434696. Its totient is φ = 813033936.

The previous prime is 1321181179. The next prime is 1321181201. The reversal of 1321181199 is 9911811231.

It is not a de Polignac number, because 1321181199 - 2⁸ = 1321180943 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321181119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 626289 + ... + 628394.

Almost surely, 2^1321181199 is an apocalyptic number.

1321181199 is a deficient number, since it is larger than the sum of its proper divisors (804253497).

1321181199 is a wasteful number, since it uses less digits than its factorization.

1321181199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254708 (or 1254699 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 1321181199 is about 36348.0563304285. The cubic root of 1321181199 is about 1097.2884173808.

The spelling of 1321181199 in words is "one billion, three hundred twenty-one million, one hundred eighty-one thousand, one hundred ninety-nine".