287049421 has 2 divisors, whose sum is σ = 287049422. Its totient is φ = 287049420.

The previous prime is 287049419. The next prime is 287049443. The reversal of 287049421 is 124940782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275394025 + 11655396 = 16595^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 287049421 - 2¹ = 287049419 is a prime.

Together with 287049419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287079421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143524710 + 143524711.

It is an arithmetic number, because the mean of its divisors is an integer number (143524711).

Almost surely, 2^287049421 is an apocalyptic number.

It is an amenable number.

287049421 is a deficient number, since it is larger than the sum of its proper divisors (1).

287049421 is an equidigital number, since it uses as much as digits as its factorization.

287049421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 287049421 is about 16942.5328980055. The cubic root of 287049421 is about 659.6580881318.

The spelling of 287049421 in words is "two hundred eighty-seven million, forty-nine thousand, four hundred twenty-one".