1118172613 has 2 divisors, whose sum is σ = 1118172614. Its totient is φ = 1118172612.

The previous prime is 1118172599. The next prime is 1118172689. The reversal of 1118172613 is 3162718111.

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., 751143649 + 367028964 = 27407^2 + 19158^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118172613 - 2¹⁷ = 1118041541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118172413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559086306 + 559086307.

It is an arithmetic number, because the mean of its divisors is an integer number (559086307).

Almost surely, 2^1118172613 is an apocalyptic number.

It is an amenable number.

1118172613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118172613 is an equidigital number, since it uses as much as digits as its factorization.

1118172613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 1118172613 is about 33439.0881006047. The cubic root of 1118172613 is about 1037.9337095682.

The spelling of 1118172613 in words is "one billion, one hundred eighteen million, one hundred seventy-two thousand, six hundred thirteen".