9891151 has 2 divisors, whose sum is σ = 9891152. Its totient is φ = 9891150.

The previous prime is 9891149. The next prime is 9891179. The reversal of 9891151 is 1511989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9891151 - 2¹ = 9891149 is a prime.

Together with 9891149, it forms a pair of twin primes.

9891151 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9891121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945575 + 4945576.

It is an arithmetic number, because the mean of its divisors is an integer number (4945576).

Almost surely, 2^9891151 is an apocalyptic number.

9891151 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891151 is an equidigital number, since it uses as much as digits as its factorization.

9891151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 34.

The square root of 9891151 is about 3145.0200317327. The cubic root of 9891151 is about 214.6589219694.

The spelling of 9891151 in words is "nine million, eight hundred ninety-one thousand, one hundred fifty-one".