9771961 has 2 divisors, whose sum is σ = 9771962. Its totient is φ = 9771960.

The previous prime is 9771953. The next prime is 9771967. The reversal of 9771961 is 1691779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 3920400 = 2419^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 9771961 - 2³ = 9771953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9771967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4885980 + 4885981.

It is an arithmetic number, because the mean of its divisors is an integer number (4885981).

Almost surely, 2^9771961 is an apocalyptic number.

It is an amenable number.

9771961 is a deficient number, since it is larger than the sum of its proper divisors (1).

9771961 is an equidigital number, since it uses as much as digits as its factorization.

9771961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 40.

The square root of 9771961 is about 3126.0135956198. The cubic root of 9771961 is about 213.7932101465.

The spelling of 9771961 in words is "nine million, seven hundred seventy-one thousand, nine hundred sixty-one".