8513138169 has 6 divisors (see below), whose sum is σ = 12296755146. Its totient is φ = 5675425440.

The previous prime is 8513138141. The next prime is 8513138213. The reversal of 8513138169 is 9618313158.

It is a happy number.

8513138169 is a `hidden beast` number, since 85 + 131 + 381 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6559056144 + 1954082025 = 80988^2 + 44205^2 .

It is not a de Polignac number, because 8513138169 - 2⁹ = 8513137657 is a prime.

It is a super-2 number, since 2×8513138169² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8513138269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 472952112 + ... + 472952129.

It is an arithmetic number, because the mean of its divisors is an integer number (2049459191).

Almost surely, 2^8513138169 is an apocalyptic number.

It is an amenable number.

8513138169 is a deficient number, since it is larger than the sum of its proper divisors (3783616977).

8513138169 is a wasteful number, since it uses less digits than its factorization.

8513138169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945904247 (or 945904244 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 8513138169 is about 92266.6687867293. The cubic root of 8513138169 is about 2041.8784895702.

The spelling of 8513138169 in words is "eight billion, five hundred thirteen million, one hundred thirty-eight thousand, one hundred sixty-nine".