9136781 has 2 divisors, whose sum is σ = 9136782. Its totient is φ = 9136780.

The previous prime is 9136747. The next prime is 9136793. The reversal of 9136781 is 1876319.

9136781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8702500 + 434281 = 2950^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 9136781 - 2⁶ = 9136717 is a prime.

It is a super-2 number, since 2×9136781² = 166961534083922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9136741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4568390 + 4568391.

It is an arithmetic number, because the mean of its divisors is an integer number (4568391).

Almost surely, 2^9136781 is an apocalyptic number.

It is an amenable number.

9136781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9136781 is an equidigital number, since it uses as much as digits as its factorization.

9136781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 9136781 is about 3022.7108694018. The cubic root of 9136781 is about 209.0568513641.

The spelling of 9136781 in words is "nine million, one hundred thirty-six thousand, seven hundred eighty-one".