609925681 has 4 divisors (see below), whose sum is σ = 609987172. Its totient is φ = 609864192.

The previous prime is 609925663. The next prime is 609925691. The reversal of 609925681 is 186529906.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186529906 = 2 ⋅93264953.

It can be written as a sum of positive squares in 2 ways, for example, as 281736225 + 328189456 = 16785^2 + 18116^2 .

It is a cyclic number.

It is not a de Polignac number, because 609925681 - 2¹⁹ = 609401393 is a prime.

It is a super-2 number, since 2×609925681² = 744018672686627522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609925691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12096 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (152496793).

Almost surely, 2^609925681 is an apocalyptic number.

It is an amenable number.

609925681 is a deficient number, since it is larger than the sum of its proper divisors (61491).

609925681 is a wasteful number, since it uses less digits than its factorization.

609925681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61490.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 609925681 is about 24696.6734804508. The cubic root of 609925681 is about 848.0581651578.

The spelling of 609925681 in words is "six hundred nine million, nine hundred twenty-five thousand, six hundred eighty-one".