913369781 has 2 divisors, whose sum is σ = 913369782. Its totient is φ = 913369780.

The previous prime is 913369763. The next prime is 913369871. The reversal of 913369781 is 187963319.

It is a happy number.

Together with next prime (913369871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632271025 + 281098756 = 25145^2 + 16766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-913369781 is a prime.

It is a super-2 number, since 2×913369781² = 1668488713687975922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913369711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456684890 + 456684891.

It is an arithmetic number, because the mean of its divisors is an integer number (456684891).

Almost surely, 2^913369781 is an apocalyptic number.

It is an amenable number.

913369781 is a deficient number, since it is larger than the sum of its proper divisors (1).

913369781 is an equidigital number, since it uses as much as digits as its factorization.

913369781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 913369781 is about 30222.0082224858. The cubic root of 913369781 is about 970.2467863237.

The spelling of 913369781 in words is "nine hundred thirteen million, three hundred sixty-nine thousand, seven hundred eighty-one".