1199992081 has 2 divisors, whose sum is σ = 1199992082. Its totient is φ = 1199992080.

The previous prime is 1199992033. The next prime is 1199992097. The reversal of 1199992081 is 1802999911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187147025 + 12845056 = 34455^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199992081 - 2⁷ = 1199991953 is a prime.

It is a super-2 number, since 2×1199992081² = 2879961988925421122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1199992021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599996040 + 599996041.

It is an arithmetic number, because the mean of its divisors is an integer number (599996041).

Almost surely, 2^1199992081 is an apocalyptic number.

It is an amenable number.

1199992081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199992081 is an equidigital number, since it uses as much as digits as its factorization.

1199992081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 49.

The square root of 1199992081 is about 34640.9018502694. The cubic root of 1199992081 is about 1062.6562316238.

The spelling of 1199992081 in words is "one billion, one hundred ninety-nine million, nine hundred ninety-two thousand, eighty-one".