287120731 has 2 divisors, whose sum is σ = 287120732. Its totient is φ = 287120730.

The previous prime is 287120699. The next prime is 287120747. The reversal of 287120731 is 137021782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 287120731 - 2⁵ = 287120699 is a prime.

It is a super-2 number, since 2×287120731² = 164876628339948722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 287120693 and 287120702.

It is not a weakly prime, because it can be changed into another prime (287120131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143560365 + 143560366.

It is an arithmetic number, because the mean of its divisors is an integer number (143560366).

Almost surely, 2^287120731 is an apocalyptic number.

287120731 is a deficient number, since it is larger than the sum of its proper divisors (1).

287120731 is an equidigital number, since it uses as much as digits as its factorization.

287120731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 287120731 is about 16944.6372342402. The cubic root of 287120731 is about 659.7127086025.

The spelling of 287120731 in words is "two hundred eighty-seven million, one hundred twenty thousand, seven hundred thirty-one".