961663 has 2 divisors, whose sum is σ = 961664. Its totient is φ = 961662.

The previous prime is 961661. The next prime is 961679. The reversal of 961663 is 366169.

It is a weak prime.

It is an emirp because it is prime and its reverse (366169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961663 - 2¹ = 961661 is a prime.

Together with 961661, it forms a pair of twin primes.

961663 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480831 + 480832.

It is an arithmetic number, because the mean of its divisors is an integer number (480832).

2⁹⁶¹⁶⁶³ is an apocalyptic number.

961663 is a deficient number, since it is larger than the sum of its proper divisors (1).

961663 is an equidigital number, since it uses as much as digits as its factorization.

961663 is an evil number, because the sum of its binary digits is even.

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

The square root of 961663 is about 980.6441760394. The cubic root of 961663 is about 98.7054127612.

It can be divided in two parts, 96166 and 3, that added together give a palindrome (96169).

The spelling of 961663 in words is "nine hundred sixty-one thousand, six hundred sixty-three".