961309 has 4 divisors (see below), whose sum is σ = 963900. Its totient is φ = 958720.

The previous prime is 961283. The next prime is 961313. The reversal of 961309 is 903169.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903169 = 641 ⋅1409.

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 178084 = 885^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 961309 - 2⁵ = 961277 is a prime.

It is a super-2 number, since 2×961309² = 1848229986962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961319) 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, 622 + ... + 1519.

It is an arithmetic number, because the mean of its divisors is an integer number (240975).

2⁹⁶¹³⁰⁹ is an apocalyptic number.

It is an amenable number.

961309 is a deficient number, since it is larger than the sum of its proper divisors (2591).

961309 is a wasteful number, since it uses less digits than its factorization.

961309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 961309 is about 980.4636658235. The cubic root of 961309 is about 98.6932997152.

The spelling of 961309 in words is "nine hundred sixty-one thousand, three hundred nine".