1155149917 has 2 divisors, whose sum is σ = 1155149918. Its totient is φ = 1155149916.

The previous prime is 1155149911. The next prime is 1155150037. The reversal of 1155149917 is 7199415511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1119973156 + 35176761 = 33466^2 + 5931^2 .

It is an emirp because it is prime and its reverse (7199415511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155149917 - 2²³ = 1146761309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155149911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577574958 + 577574959.

It is an arithmetic number, because the mean of its divisors is an integer number (577574959).

Almost surely, 2^1155149917 is an apocalyptic number.

It is an amenable number.

1155149917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155149917 is an equidigital number, since it uses as much as digits as its factorization.

1155149917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 43.

The square root of 1155149917 is about 33987.4964803235. The cubic root of 1155149917 is about 1049.2511416281.

The spelling of 1155149917 in words is "one billion, one hundred fifty-five million, one hundred forty-nine thousand, nine hundred seventeen".