609951 has 4 divisors (see below), whose sum is σ = 813272. Its totient is φ = 406632.

The previous prime is 609929. The next prime is 609979. The reversal of 609951 is 159906.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 609951 - 2⁶ = 609887 is a prime.

It is a D-number.

It is a Duffinian number.

609951 is a lucky number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 101656 + ... + 101661.

It is an arithmetic number, because the mean of its divisors is an integer number (203318).

2⁶⁰⁹⁹⁵¹ is an apocalyptic number.

609951 is a deficient number, since it is larger than the sum of its proper divisors (203321).

609951 is a wasteful number, since it uses less digits than its factorization.

609951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203320.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 609951 is about 780.9935979251. The cubic root of 609951 is about 84.8069899750.

It can be divided in two parts, 60 and 9951, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 609951 in words is "six hundred nine thousand, nine hundred fifty-one".