1102120661 has 2 divisors, whose sum is σ = 1102120662. Its totient is φ = 1102120660.

The previous prime is 1102120627. The next prime is 1102120681. The reversal of 1102120661 is 1660212011.

It is an a-pointer prime, because the next prime (1102120681) can be obtained adding 1102120661 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989102500 + 113018161 = 31450^2 + 10631^2 .

It is an emirp because it is prime and its reverse (1660212011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1102120661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1102120681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551060330 + 551060331.

It is an arithmetic number, because the mean of its divisors is an integer number (551060331).

Almost surely, 2^1102120661 is an apocalyptic number.

It is an amenable number.

1102120661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1102120661 is an equidigital number, since it uses as much as digits as its factorization.

1102120661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1102120661 is about 33198.2026772535. The cubic root of 1102120661 is about 1032.9430581554.

Adding to 1102120661 its reverse (1660212011), we get a palindrome (2762332672).

The spelling of 1102120661 in words is "one billion, one hundred two million, one hundred twenty thousand, six hundred sixty-one".