287191397 has 2 divisors, whose sum is σ = 287191398. Its totient is φ = 287191396.

The previous prime is 287191369. The next prime is 287191423. The reversal of 287191397 is 793191782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275261281 + 11930116 = 16591^2 + 3454^2 .

It is a cyclic number.

It is not a de Polignac number, because 287191397 - 2¹² = 287187301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287191357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143595698 + 143595699.

It is an arithmetic number, because the mean of its divisors is an integer number (143595699).

Almost surely, 2^287191397 is an apocalyptic number.

It is an amenable number.

287191397 is a deficient number, since it is larger than the sum of its proper divisors (1).

287191397 is an equidigital number, since it uses as much as digits as its factorization.

287191397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 287191397 is about 16946.7223084584. The cubic root of 287191397 is about 659.7668268753.

The spelling of 287191397 in words is "two hundred eighty-seven million, one hundred ninety-one thousand, three hundred ninety-seven".