287891291213 has 2 divisors, whose sum is σ = 287891291214. Its totient is φ = 287891291212.

The previous prime is 287891291209. The next prime is 287891291279. The reversal of 287891291213 is 312192198782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181942343209 + 105948948004 = 426547^2 + 325498^2 .

It is a cyclic number.

It is not a de Polignac number, because 287891291213 - 2² = 287891291209 is a prime.

It is a super-2 number, since 2×287891291213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287891291813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143945645606 + 143945645607.

It is an arithmetic number, because the mean of its divisors is an integer number (143945645607).

Almost surely, 2^287891291213 is an apocalyptic number.

It is an amenable number.

287891291213 is a deficient number, since it is larger than the sum of its proper divisors (1).

287891291213 is an equidigital number, since it uses as much as digits as its factorization.

287891291213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The spelling of 287891291213 in words is "two hundred eighty-seven billion, eight hundred ninety-one million, two hundred ninety-one thousand, two hundred thirteen".