961921 has 4 divisors (see below), whose sum is σ = 975172. Its totient is φ = 948672.

The previous prime is 961879. The next prime is 961927. The reversal of 961921 is 129169.

961921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 583696 + 378225 = 764^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 961921 - 2¹¹ = 959873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 961921.

It is not an unprimeable number, because it can be changed into a prime (961927) 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, 6516 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (243793).

2⁹⁶¹⁹²¹ is an apocalyptic number.

It is an amenable number.

961921 is a deficient number, since it is larger than the sum of its proper divisors (13251).

961921 is a wasteful number, since it uses less digits than its factorization.

961921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13250.

The product of its digits is 972, while the sum is 28.

The square root of 961921 is about 980.7757134024. The cubic root of 961921 is about 98.7142390408.

The spelling of 961921 in words is "nine hundred sixty-one thousand, nine hundred twenty-one".