961813 has 2 divisors, whose sum is σ = 961814. Its totient is φ = 961812.

The previous prime is 961811. The next prime is 961817. The reversal of 961813 is 318169.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956484 + 5329 = 978^2 + 73^2 .

It is a cyclic number.

It is not a de Polignac number, because 961813 - 2¹ = 961811 is a prime.

Together with 961811, it forms a pair of twin primes.

961813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961811) 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 as a sum of consecutive naturals, namely, 480906 + 480907.

It is an arithmetic number, because the mean of its divisors is an integer number (480907).

2⁹⁶¹⁸¹³ is an apocalyptic number.

It is an amenable number.

961813 is a deficient number, since it is larger than the sum of its proper divisors (1).

961813 is an equidigital number, since it uses as much as digits as its factorization.

961813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 961813 is about 980.7206533973. The cubic root of 961813 is about 98.7105445111.

The spelling of 961813 in words is "nine hundred sixty-one thousand, eight hundred thirteen".