9971913 has 16 divisors (see below), whose sum is σ = 15319040. Its totient is φ = 5651856.

The previous prime is 9971887. The next prime is 9971917. The reversal of 9971913 is 3191799.

It is not a de Polignac number, because 9971913 - 2⁵ = 9971881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9971917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798 + ... + 4536.

It is an arithmetic number, because the mean of its divisors is an integer number (957440).

Almost surely, 2^9971913 is an apocalyptic number.

It is an amenable number.

9971913 is a deficient number, since it is larger than the sum of its proper divisors (5347127).

9971913 is a wasteful number, since it uses less digits than its factorization.

9971913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876.

The product of its digits is 15309, while the sum is 39.

The square root of 9971913 is about 3157.8335928291. The cubic root of 9971913 is about 215.2415745076.

The spelling of 9971913 in words is "nine million, nine hundred seventy-one thousand, nine hundred thirteen".