1155240013 has 2 divisors, whose sum is σ = 1155240014. Its totient is φ = 1155240012.

The previous prime is 1155239999. The next prime is 1155240029. The reversal of 1155240013 is 3100425511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748733769 + 406506244 = 27363^2 + 20162^2 .

It is an emirp because it is prime and its reverse (3100425511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155240013 - 2²⁵ = 1121685581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155240613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577620006 + 577620007.

It is an arithmetic number, because the mean of its divisors is an integer number (577620007).

Almost surely, 2^1155240013 is an apocalyptic number.

It is an amenable number.

1155240013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155240013 is an equidigital number, since it uses as much as digits as its factorization.

1155240013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1155240013 is about 33988.8218830839. The cubic root of 1155240013 is about 1049.2784197248.

Adding to 1155240013 its reverse (3100425511), we get a palindrome (4255665524).

The spelling of 1155240013 in words is "one billion, one hundred fifty-five million, two hundred forty thousand, thirteen".