913227781 has 2 divisors, whose sum is σ = 913227782. Its totient is φ = 913227780.

The previous prime is 913227779. The next prime is 913227797. The reversal of 913227781 is 187722319.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 888636100 + 24591681 = 29810^2 + 4959^2 .

It is an emirp because it is prime and its reverse (187722319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 913227781 - 2¹ = 913227779 is a prime.

It is a super-2 number, since 2×913227781² = 1667969959980367922, which contains 22 as substring.

Together with 913227779, 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 (913227701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456613890 + 456613891.

It is an arithmetic number, because the mean of its divisors is an integer number (456613891).

Almost surely, 2^913227781 is an apocalyptic number.

It is an amenable number.

913227781 is a deficient number, since it is larger than the sum of its proper divisors (1).

913227781 is an equidigital number, since it uses as much as digits as its factorization.

913227781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 913227781 is about 30219.6588498282. The cubic root of 913227781 is about 970.1965028616.

The spelling of 913227781 in words is "nine hundred thirteen million, two hundred twenty-seven thousand, seven hundred eighty-one".