609981306169 has 9 divisors (see below), whose sum is σ = 611676893037. Its totient is φ = 608290413024.

The previous prime is 609981306167. The next prime is 609981306217. The reversal of 609981306169 is 961603189906.

The square root of 609981306169 is 781013.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3159002025 + 606822304144 = 56205^2 + 778988^2 .

It is not a de Polignac number, because 609981306169 - 2¹ = 609981306167 is a prime.

It is a super-2 number, since 2×609981306169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609981306167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 356922087 + ... + 356923795.

Almost surely, 2^609981306169 is an apocalyptic number.

609981306169 is the 781013-rd square number.

609981306169 is the 390507-th centered octagonal number.

It is an amenable number.

609981306169 is a deficient number, since it is larger than the sum of its proper divisors (1695586868).

609981306169 is an frugal number, since it uses more digits than its factorization.

609981306169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 58.

The spelling of 609981306169 in words is "six hundred nine billion, nine hundred eighty-one million, three hundred six thousand, one hundred sixty-nine".