It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1699699 = 31 ⋅54829.
It is a 4-Lehmer number, since φ(9969961) divides (9969961-1)4.
It is a cyclic number.
It is a Duffinian number.
Almost surely, 29969961 is an apocalyptic number.
It is an amenable number.
9969961 is a wasteful number, since it uses less digits than its factorization.
9969961 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 47462.
The square root of 9969961 is about 3157.5245050514. The cubic root of 9969961 is about 215.2275290925.
The spelling of 9969961 in words is "nine million, nine hundred sixty-nine thousand, nine hundred sixty-one".