961643 has 2 divisors, whose sum is σ = 961644. Its totient is φ = 961642.

The previous prime is 961637. The next prime is 961657. The reversal of 961643 is 346169.

It is a weak prime.

It is an emirp because it is prime and its reverse (346169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961643 - 2⁴ = 961627 is a prime.

It is not a weakly prime, because it can be changed into another prime (961613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480821 + 480822.

It is an arithmetic number, because the mean of its divisors is an integer number (480822).

2⁹⁶¹⁶⁴³ is an apocalyptic number.

961643 is a deficient number, since it is larger than the sum of its proper divisors (1).

961643 is an equidigital number, since it uses as much as digits as its factorization.

961643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 961643 is about 980.6339786077. The cubic root of 961643 is about 98.7047284875.

The spelling of 961643 in words is "nine hundred sixty-one thousand, six hundred forty-three".