9919971 has 12 divisors (see below), whose sum is σ = 14662648. Its totient is φ = 6459264.

The previous prime is 9919963. The next prime is 9919979. The reversal of 9919971 is 1799199.

It is an interprime number because it is at equal distance from previous prime (9919963) and next prime (9919979).

It is not a de Polignac number, because 9919971 - 2³ = 9919963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9919979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12430 + ... + 13203.

Almost surely, 2^9919971 is an apocalyptic number.

9919971 is a deficient number, since it is larger than the sum of its proper divisors (4742677).

9919971 is a wasteful number, since it uses less digits than its factorization.

9919971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25682 (or 25679 counting only the distinct ones).

The product of its digits is 45927, while the sum is 45.

The square root of 9919971 is about 3149.5985458468. The cubic root of 9919971 is about 214.8672048174.

The spelling of 9919971 in words is "nine million, nine hundred nineteen thousand, nine hundred seventy-one".