287421913 has 2 divisors, whose sum is σ = 287421914. Its totient is φ = 287421912.

The previous prime is 287421899. The next prime is 287421919. The reversal of 287421913 is 319124782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285339664 + 2082249 = 16892^2 + 1443^2 .

It is a cyclic number.

It is not a de Polignac number, because 287421913 - 2⁵ = 287421881 is a prime.

It is a super-2 number, since 2×287421913² = 165222712145159138, which contains 22 as substring.

It is equal to p_15607198 and since 287421913 and 15607198 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (287421919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143710956 + 143710957.

It is an arithmetic number, because the mean of its divisors is an integer number (143710957).

Almost surely, 2^287421913 is an apocalyptic number.

It is an amenable number.

287421913 is a deficient number, since it is larger than the sum of its proper divisors (1).

287421913 is an equidigital number, since it uses as much as digits as its factorization.

287421913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 287421913 is about 16953.5221414313. The cubic root of 287421913 is about 659.9433016797.

The spelling of 287421913 in words is "two hundred eighty-seven million, four hundred twenty-one thousand, nine hundred thirteen".