654138169 has 4 divisors (see below), whose sum is σ = 654377344. Its totient is φ = 653898996.

The previous prime is 654138157. The next prime is 654138241. The reversal of 654138169 is 961831456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 654138169 - 2⁷ = 654138041 is a prime.

It is a super-2 number, since 2×654138169² = 855793488285345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654138119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115437 + ... + 120970.

It is an arithmetic number, because the mean of its divisors is an integer number (163594336).

Almost surely, 2^654138169 is an apocalyptic number.

It is an amenable number.

654138169 is a deficient number, since it is larger than the sum of its proper divisors (239175).

654138169 is a wasteful number, since it uses less digits than its factorization.

654138169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239174.

The product of its digits is 155520, while the sum is 43.

The square root of 654138169 is about 25576.1249801451. The cubic root of 654138169 is about 868.0734968771.

The spelling of 654138169 in words is "six hundred fifty-four million, one hundred thirty-eight thousand, one hundred sixty-nine".