961767581 has 2 divisors, whose sum is σ = 961767582. Its totient is φ = 961767580.

The previous prime is 961767523. The next prime is 961767601. The reversal of 961767581 is 185767169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826045081 + 135722500 = 28741^2 + 11650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961767581 is a prime.

It is a super-2 number, since 2×961767581² = 1849993759725183122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961767881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480883790 + 480883791.

It is an arithmetic number, because the mean of its divisors is an integer number (480883791).

Almost surely, 2^961767581 is an apocalyptic number.

It is an amenable number.

961767581 is a deficient number, since it is larger than the sum of its proper divisors (1).

961767581 is an equidigital number, since it uses as much as digits as its factorization.

961767581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The square root of 961767581 is about 31012.3778675548. The cubic root of 961767581 is about 987.0899070780.

The spelling of 961767581 in words is "nine hundred sixty-one million, seven hundred sixty-seven thousand, five hundred eighty-one".