963661 has 8 divisors (see below), whose sum is σ = 1030880. Its totient is φ = 898128.

The previous prime is 963659. The next prime is 963667. The reversal of 963661 is 166369.

963661 = T₁₃₅ + T₁₃₆ + ... + T₂₀₁.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 963661 - 2¹ = 963659 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 963661.

It is not an unprimeable number, because it can be changed into a prime (963667) 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 7 ways as a sum of consecutive naturals, for example, 895 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (128860).

2⁹⁶³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

963661 is a deficient number, since it is larger than the sum of its proper divisors (67219).

963661 is a wasteful number, since it uses less digits than its factorization.

963661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its digits is 5832, while the sum is 31.

The square root of 963661 is about 981.6623655820. The cubic root of 963661 is about 98.7737239374.

The spelling of 963661 in words is "nine hundred sixty-three thousand, six hundred sixty-one".