9951091 has 4 divisors (see below), whose sum is σ = 9966184. Its totient is φ = 9936000.

The previous prime is 9951083. The next prime is 9951101. The reversal of 9951091 is 1901599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1901599 = 7 ⋅271657.

It is a cyclic number.

It is not a de Polignac number, because 9951091 - 2³ = 9951083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9951191) 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, 6510 + ... + 7891.

It is an arithmetic number, because the mean of its divisors is an integer number (2491546).

Almost surely, 2^9951091 is an apocalyptic number.

9951091 is a deficient number, since it is larger than the sum of its proper divisors (15093).

9951091 is a wasteful number, since it uses less digits than its factorization.

9951091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15092.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 9951091 is about 3154.5349895032. The cubic root of 9951091 is about 215.0916573322.

The spelling of 9951091 in words is "nine million, nine hundred fifty-one thousand, ninety-one".