287513381 has 2 divisors, whose sum is σ = 287513382. Its totient is φ = 287513380.

The previous prime is 287513357. The next prime is 287513383. The reversal of 287513381 is 183315782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275892100 + 11621281 = 16610^2 + 3409^2 .

It is a cyclic number.

It is not a de Polignac number, because 287513381 - 2²² = 283319077 is a prime.

It is a super-3 number, since 3×287513381³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 287513383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287513383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143756690 + 143756691.

It is an arithmetic number, because the mean of its divisors is an integer number (143756691).

Almost surely, 2^287513381 is an apocalyptic number.

It is an amenable number.

287513381 is a deficient number, since it is larger than the sum of its proper divisors (1).

287513381 is an equidigital number, since it uses as much as digits as its factorization.

287513381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 287513381 is about 16956.2195373851. The cubic root of 287513381 is about 660.0133001605.

The spelling of 287513381 in words is "two hundred eighty-seven million, five hundred thirteen thousand, three hundred eighty-one".