609961 has 9 divisors (see below), whose sum is σ = 680029. Its totient is φ = 546700.

The previous prime is 609929. The next prime is 609979. The reversal of 609961 is 169906.

The square root of 609961 is 781.

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

609961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 609961 - 2⁵ = 609929 is a prime.

It is a pancake number, because a pancake can be divided into 609961 parts by 1104 straight cuts.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609961.

It is not an unprimeable number, because it can be changed into a prime (609911) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8556 + ... + 8626.

2⁶⁰⁹⁹⁶¹ is an apocalyptic number.

609961 is the 781-st square number.

609961 is the 391-st centered octagonal number.

It is an amenable number.

609961 is a deficient number, since it is larger than the sum of its proper divisors (70068).

609961 is an equidigital number, since it uses as much as digits as its factorization.

609961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The cubic root of 609961 is about 84.8074534359.

Multiplying 609961 by its product of nonzero digits (2916), we get a square (1778646276 = 42174²).

The spelling of 609961 in words is "six hundred nine thousand, nine hundred sixty-one".