1091678317 has 2 divisors, whose sum is σ = 1091678318. Its totient is φ = 1091678316.

The previous prime is 1091678249. The next prime is 1091678323. The reversal of 1091678317 is 7138761901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929396196 + 162282121 = 30486^2 + 12739^2 .

It is an emirp because it is prime and its reverse (7138761901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091678317 - 2¹⁵ = 1091645549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091675317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545839158 + 545839159.

It is an arithmetic number, because the mean of its divisors is an integer number (545839159).

Almost surely, 2^1091678317 is an apocalyptic number.

It is an amenable number.

1091678317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091678317 is an equidigital number, since it uses as much as digits as its factorization.

1091678317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 1091678317 is about 33040.5556400010. Note that the first 3 decimals coincide. The cubic root of 1091678317 is about 1029.6703997705.

The spelling of 1091678317 in words is "one billion, ninety-one million, six hundred seventy-eight thousand, three hundred seventeen".