1155111641 has 2 divisors, whose sum is σ = 1155111642. Its totient is φ = 1155111640.

The previous prime is 1155111583. The next prime is 1155111653. The reversal of 1155111641 is 1461115511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 837523600 + 317588041 = 28940^2 + 17821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155111641 - 2¹⁴ = 1155095257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155111641.

It is not a weakly prime, because it can be changed into another prime (1155111241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577555820 + 577555821.

It is an arithmetic number, because the mean of its divisors is an integer number (577555821).

Almost surely, 2^1155111641 is an apocalyptic number.

It is an amenable number.

1155111641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155111641 is an equidigital number, since it uses as much as digits as its factorization.

1155111641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 26.

The square root of 1155111641 is about 33986.9333862295. The cubic root of 1155111641 is about 1049.2395524887.

The spelling of 1155111641 in words is "one billion, one hundred fifty-five million, one hundred eleven thousand, six hundred forty-one".