961217681 has 2 divisors, whose sum is σ = 961217682. Its totient is φ = 961217680.

The previous prime is 961217671. The next prime is 961217729. The reversal of 961217681 is 186712169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 862890625 + 98327056 = 29375^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 961217681 - 2⁶ = 961217617 is a prime.

It is a super-2 number, since 2×961217681² = 1847878860534035522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (961217611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480608840 + 480608841.

It is an arithmetic number, because the mean of its divisors is an integer number (480608841).

Almost surely, 2^961217681 is an apocalyptic number.

It is an amenable number.

961217681 is a deficient number, since it is larger than the sum of its proper divisors (1).

961217681 is an equidigital number, since it uses as much as digits as its factorization.

961217681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 961217681 is about 31003.5107850708. The cubic root of 961217681 is about 986.9017451166.

The spelling of 961217681 in words is "nine hundred sixty-one million, two hundred seventeen thousand, six hundred eighty-one".