961599 has 4 divisors (see below), whose sum is σ = 1282136. Its totient is φ = 641064.

The previous prime is 961567. The next prime is 961601. The reversal of 961599 is 995169.

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

It is not a de Polignac number, because 961599 - 2⁵ = 961567 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160264 + ... + 160269.

It is an arithmetic number, because the mean of its divisors is an integer number (320534).

2⁹⁶¹⁵⁹⁹ is an apocalyptic number.

961599 is a deficient number, since it is larger than the sum of its proper divisors (320537).

961599 is a wasteful number, since it uses less digits than its factorization.

961599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320536.

The product of its digits is 21870, while the sum is 39.

The square root of 961599 is about 980.6115438847. The cubic root of 961599 is about 98.7032230521.

The spelling of 961599 in words is "nine hundred sixty-one thousand, five hundred ninety-nine".