9071991 has 12 divisors (see below), whose sum is σ = 13208832. Its totient is φ = 5999616.

The previous prime is 9071989. The next prime is 9072031. The reversal of 9071991 is 1991709.

It is not a de Polignac number, because 9071991 - 2¹ = 9071989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9071971) 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, 2826 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^9071991 is an apocalyptic number.

9071991 is a deficient number, since it is larger than the sum of its proper divisors (4136841).

9071991 is a wasteful number, since it uses less digits than its factorization.

9071991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070 (or 8067 counting only the distinct ones).

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

The square root of 9071991 is about 3011.9746014865. The cubic root of 9071991 is about 208.5615297244.

The spelling of 9071991 in words is "nine million, seventy-one thousand, nine hundred ninety-one".