1155120077 has 2 divisors, whose sum is σ = 1155120078. Its totient is φ = 1155120076.

The previous prime is 1155120023. The next prime is 1155120079. The reversal of 1155120077 is 7700215511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821911561 + 333208516 = 28669^2 + 18254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155120077 - 2¹⁶ = 1155054541 is a prime.

Together with 1155120079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155120079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577560038 + 577560039.

It is an arithmetic number, because the mean of its divisors is an integer number (577560039).

Almost surely, 2^1155120077 is an apocalyptic number.

It is an amenable number.

1155120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155120077 is an equidigital number, since it uses as much as digits as its factorization.

1155120077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2450, while the sum is 29.

The square root of 1155120077 is about 33987.0574925221. The cubic root of 1155120077 is about 1049.2421067478.

Adding to 1155120077 its reverse (7700215511), we get a palindrome (8855335588).

The spelling of 1155120077 in words is "one billion, one hundred fifty-five million, one hundred twenty thousand, seventy-seven".