8191129 has 2 divisors, whose sum is σ = 8191130. Its totient is φ = 8191128.

The previous prime is 8191123. The next prime is 8191133. The reversal of 8191129 is 9211918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5631129 + 2560000 = 2373^2 + 1600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8191129 is a prime.

It is a pancake number, because a pancake can be divided into 8191129 parts by 4047 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 8191129.

It is not a weakly prime, because it can be changed into another prime (8191123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095564 + 4095565.

It is an arithmetic number, because the mean of its divisors is an integer number (4095565).

Almost surely, 2^8191129 is an apocalyptic number.

It is an amenable number.

8191129 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191129 is an equidigital number, since it uses as much as digits as its factorization.

8191129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 8191129 is about 2862.0148497169. The cubic root of 8191129 is about 201.5802232558.

The spelling of 8191129 in words is "eight million, one hundred ninety-one thousand, one hundred twenty-nine".