9111961 has 2 divisors, whose sum is σ = 9111962.
Its totient is φ = 9111960.
The previous prime is 9111959. The next prime is 9112043. The reversal of 9111961 is 1691119.
9111961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 6031936 + 3080025 = 2456^2 + 1755^2
It is an emirp because it is prime and its reverse (1691119) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9111961 - 21 = 9111959 is a prime.
Together with 9111959, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (9111911) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4555980 + 4555981.
It is an arithmetic number, because the mean of its divisors is an integer number (4555981).
Almost surely, 29111961 is an apocalyptic number.
It is an amenable number.
9111961 is a deficient number, since it is larger than the sum of its proper divisors (1).
9111961 is an equidigital number, since it uses as much as digits as its factorization.
9111961 is an evil number, because the sum of its binary digits is even.
The product of its digits is 486, while the sum is 28.
The square root of 9111961 is about 3018.6024912201.
The cubic root of 9111961 is about 208.8673792151.
The spelling of 9111961 in words is "nine million, one hundred eleven thousand, nine hundred sixty-one".