287361331 has 4 divisors (see below), whose sum is σ = 290590200. Its totient is φ = 284132464.

The previous prime is 287361317. The next prime is 287361359. The reversal of 287361331 is 133163782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 287361331 - 2²⁵ = 253806899 is a prime.

It is a super-2 number, since 2×287361331² = 165153069108183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287361311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614301 + ... + 1614478.

It is an arithmetic number, because the mean of its divisors is an integer number (72647550).

Almost surely, 2^287361331 is an apocalyptic number.

287361331 is a deficient number, since it is larger than the sum of its proper divisors (3228869).

287361331 is an equidigital number, since it uses as much as digits as its factorization.

287361331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228868.

The product of its digits is 18144, while the sum is 34.

The square root of 287361331 is about 16951.7353388967. The cubic root of 287361331 is about 659.8969314105.

The spelling of 287361331 in words is "two hundred eighty-seven million, three hundred sixty-one thousand, three hundred thirty-one".