1538117117 has 2 divisors, whose sum is σ = 1538117118. Its totient is φ = 1538117116.

The previous prime is 1538117071. The next prime is 1538117137. The reversal of 1538117117 is 7117118351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799419076 + 738698041 = 28274^2 + 27179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538117117 - 2²⁸ = 1269681661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1538117137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769058558 + 769058559.

It is an arithmetic number, because the mean of its divisors is an integer number (769058559).

Almost surely, 2^1538117117 is an apocalyptic number.

It is an amenable number.

1538117117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538117117 is an equidigital number, since it uses as much as digits as its factorization.

1538117117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 35.

The square root of 1538117117 is about 39218.8362524948. The cubic root of 1538117117 is about 1154.3295189692.

The spelling of 1538117117 in words is "one billion, five hundred thirty-eight million, one hundred seventeen thousand, one hundred seventeen".