287798197 has 2 divisors, whose sum is σ = 287798198. Its totient is φ = 287798196.

The previous prime is 287798191. The next prime is 287798201. The reversal of 287798197 is 791897782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254689681 + 33108516 = 15959^2 + 5754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287798197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287798191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143899098 + 143899099.

It is an arithmetic number, because the mean of its divisors is an integer number (143899099).

Almost surely, 2^287798197 is an apocalyptic number.

It is an amenable number.

287798197 is a deficient number, since it is larger than the sum of its proper divisors (1).

287798197 is an equidigital number, since it uses as much as digits as its factorization.

287798197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 58.

The square root of 287798197 is about 16964.6160286639. The cubic root of 287798197 is about 660.2311686398.

The spelling of 287798197 in words is "two hundred eighty-seven million, seven hundred ninety-eight thousand, one hundred ninety-seven".