961649 has 4 divisors (see below), whose sum is σ = 1035636. Its totient is φ = 887664.

The previous prime is 961643. The next prime is 961657. The reversal of 961649 is 946169.

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 409600 + 552049 = 640^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 961649 - 2⁴ = 961633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36974 + ... + 36999.

It is an arithmetic number, because the mean of its divisors is an integer number (258909).

2⁹⁶¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

961649 is a deficient number, since it is larger than the sum of its proper divisors (73987).

961649 is a wasteful number, since it uses less digits than its factorization.

961649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73986.

The product of its digits is 11664, while the sum is 35.

The square root of 961649 is about 980.6370378484. The cubic root of 961649 is about 98.7049337706.

The spelling of 961649 in words is "nine hundred sixty-one thousand, six hundred forty-nine".