609081681 has 16 divisors (see below), whose sum is σ = 875645120. Its totient is φ = 374362560.

The previous prime is 609081677. The next prime is 609081709. The reversal of 609081681 is 186180906.

It is not a de Polignac number, because 609081681 - 2² = 609081677 is a prime.

It is a super-2 number, since 2×609081681² = 741960988259571522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (609081631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24411 + ... + 42591.

It is an arithmetic number, because the mean of its divisors is an integer number (54727820).

Almost surely, 2^609081681 is an apocalyptic number.

It is an amenable number.

609081681 is a deficient number, since it is larger than the sum of its proper divisors (266563439).

609081681 is a wasteful number, since it uses less digits than its factorization.

609081681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19056.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 609081681 is about 24679.5802435941. The cubic root of 609081681 is about 847.6668106488. Note that the first 3 decimals are identical.

The spelling of 609081681 in words is "six hundred nine million, eighty-one thousand, six hundred eighty-one".