287122241891 has 2 divisors, whose sum is σ = 287122241892. Its totient is φ = 287122241890.

The previous prime is 287122241881. The next prime is 287122241929. The reversal of 287122241891 is 198142221782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287122241891 is a prime.

It is a super-3 number, since 3×287122241891³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (287122241881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143561120945 + 143561120946.

It is an arithmetic number, because the mean of its divisors is an integer number (143561120946).

Almost surely, 2^287122241891 is an apocalyptic number.

287122241891 is a deficient number, since it is larger than the sum of its proper divisors (1).

287122241891 is an equidigital number, since it uses as much as digits as its factorization.

287122241891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The spelling of 287122241891 in words is "two hundred eighty-seven billion, one hundred twenty-two million, two hundred forty-one thousand, eight hundred ninety-one".