9971491 has 4 divisors (see below), whose sum is σ = 10293184. Its totient is φ = 9649800.

The previous prime is 9971483. The next prime is 9971497. The reversal of 9971491 is 1941799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9971491 - 2³ = 9971483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9971497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160800 + ... + 160861.

It is an arithmetic number, because the mean of its divisors is an integer number (2573296).

Almost surely, 2^9971491 is an apocalyptic number.

9971491 is a deficient number, since it is larger than the sum of its proper divisors (321693).

9971491 is a wasteful number, since it uses less digits than its factorization.

9971491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321692.

The product of its digits is 20412, while the sum is 40.

The square root of 9971491 is about 3157.7667741618. The cubic root of 9971491 is about 215.2385382053.

The spelling of 9971491 in words is "nine million, nine hundred seventy-one thousand, four hundred ninety-one".