961910581 has 2 divisors, whose sum is σ = 961910582. Its totient is φ = 961910580.

The previous prime is 961910569. The next prime is 961910591. The reversal of 961910581 is 185019169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560268900 + 401641681 = 23670^2 + 20041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961910581 is a prime.

It is a super-2 number, since 2×961910581² = 1850543931679515122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961910591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480955290 + 480955291.

It is an arithmetic number, because the mean of its divisors is an integer number (480955291).

Almost surely, 2^961910581 is an apocalyptic number.

It is an amenable number.

961910581 is a deficient number, since it is larger than the sum of its proper divisors (1).

961910581 is an equidigital number, since it uses as much as digits as its factorization.

961910581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 961910581 is about 31014.6833129084. The cubic root of 961910581 is about 987.1388263333.

The spelling of 961910581 in words is "nine hundred sixty-one million, nine hundred ten thousand, five hundred eighty-one".