9961421 has 2 divisors, whose sum is σ = 9961422.
Its totient is φ = 9961420.
The previous prime is 9961397. The next prime is 9961429. The reversal of 9961421 is 1241699.
9961421 is digitally balanced in base 3, 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., 9954025 + 7396 = 3155^2 + 86^2
It is an emirp because it is prime and its reverse (1241699) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9961421 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9961429) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980710 + 4980711.
It is an arithmetic number, because the mean of its divisors is an integer number (4980711).
Almost surely, 29961421 is an apocalyptic number.
It is an amenable number.
9961421 is a deficient number, since it is larger than the sum of its proper divisors (1).
9961421 is an equidigital number, since it uses as much as digits as its factorization.
9961421 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3888, while the sum is 32.
The square root of 9961421 is about 3156.1718901226.
The cubic root of 9961421 is about 215.1660588368.
The spelling of 9961421 in words is "nine million, nine hundred sixty-one thousand, four hundred twenty-one".