781130222101 has 2 divisors, whose sum is σ = 781130222102. Its totient is φ = 781130222100.

The previous prime is 781130222099. The next prime is 781130222111. The reversal of 781130222101 is 101222031187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781128954225 + 1267876 = 883815^2 + 1126^2 .

It is an emirp because it is prime and its reverse (101222031187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781130222101 - 2¹ = 781130222099 is a prime.

It is a super-4 number, since 4×781130222101⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 781130222099, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 781130222101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781130222111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390565111050 + 390565111051.

It is an arithmetic number, because the mean of its divisors is an integer number (390565111051).

Almost surely, 2^781130222101 is an apocalyptic number.

It is an amenable number.

781130222101 is a deficient number, since it is larger than the sum of its proper divisors (1).

781130222101 is an equidigital number, since it uses as much as digits as its factorization.

781130222101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

Adding to 781130222101 its reverse (101222031187), we get a palindrome (882352253288).

The spelling of 781130222101 in words is "seven hundred eighty-one billion, one hundred thirty million, two hundred twenty-two thousand, one hundred one".