9971091 has 12 divisors (see below), whose sum is σ = 15510768. Its totient is φ = 6135984.

The previous prime is 9971063. The next prime is 9971107. The reversal of 9971091 is 1901799.

It is not a de Polignac number, because 9971091 - 2⁹ = 9970579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9976091) 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, 42495 + ... + 42728.

It is an arithmetic number, because the mean of its divisors is an integer number (1292564).

Almost surely, 2^9971091 is an apocalyptic number.

9971091 is a deficient number, since it is larger than the sum of its proper divisors (5539677).

9971091 is a wasteful number, since it uses less digits than its factorization.

9971091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85242 (or 85239 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 9971091 is about 3157.7034376268. The cubic root of 9971091 is about 215.2356601146.

The spelling of 9971091 in words is "nine million, nine hundred seventy-one thousand, ninety-one".