287478251 has 2 divisors, whose sum is σ = 287478252. Its totient is φ = 287478250.

The previous prime is 287478239. The next prime is 287478281. The reversal of 287478251 is 152874782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287478251 - 2¹⁰ = 287477227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (287478281) 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, 143739125 + 143739126.

It is an arithmetic number, because the mean of its divisors is an integer number (143739126).

Almost surely, 2^287478251 is an apocalyptic number.

287478251 is a deficient number, since it is larger than the sum of its proper divisors (1).

287478251 is an equidigital number, since it uses as much as digits as its factorization.

287478251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250880, while the sum is 44.

The square root of 287478251 is about 16955.1836026626. The cubic root of 287478251 is about 659.9864176880.

The spelling of 287478251 in words is "two hundred eighty-seven million, four hundred seventy-eight thousand, two hundred fifty-one".