961961281 has 2 divisors, whose sum is σ = 961961282. Its totient is φ = 961961280.

The previous prime is 961961251. The next prime is 961961309. The reversal of 961961281 is 182169169.

961961281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894967056 + 66994225 = 29916^2 + 8185^2 .

It is a cyclic number.

It is not a de Polignac number, because 961961281 - 2⁷ = 961961153 is a prime.

It is a super-2 number, since 2×961961281² = 1850739012286321922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (961961251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480980640 + 480980641.

It is an arithmetic number, because the mean of its divisors is an integer number (480980641).

Almost surely, 2^961961281 is an apocalyptic number.

It is an amenable number.

961961281 is a deficient number, since it is larger than the sum of its proper divisors (1).

961961281 is an equidigital number, since it uses as much as digits as its factorization.

961961281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 961961281 is about 31015.5006569296. The cubic root of 961961281 is about 987.1561692687.

The spelling of 961961281 in words is "nine hundred sixty-one million, nine hundred sixty-one thousand, two hundred eighty-one".