1199816081 has 2 divisors, whose sum is σ = 1199816082. Its totient is φ = 1199816080.

The previous prime is 1199816053. The next prime is 1199816099. The reversal of 1199816081 is 1806189911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029383056 + 170433025 = 32084^2 + 13055^2 .

It is an emirp because it is prime and its reverse (1806189911) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1809186611 and 1166819081.

It is a cyclic number.

It is not a de Polignac number, because 1199816081 - 2⁶ = 1199816017 is a prime.

It is a super-2 number, since 2×1199816081² = 2879117256452397122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1199816041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599908040 + 599908041.

It is an arithmetic number, because the mean of its divisors is an integer number (599908041).

Almost surely, 2^1199816081 is an apocalyptic number.

It is an amenable number.

1199816081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199816081 is an equidigital number, since it uses as much as digits as its factorization.

1199816081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 44.

The square root of 1199816081 is about 34638.3614075493. The cubic root of 1199816081 is about 1062.6042766584.

The spelling of 1199816081 in words is "one billion, one hundred ninety-nine million, eight hundred sixteen thousand, eighty-one".