91351109 has 2 divisors, whose sum is σ = 91351110. Its totient is φ = 91351108.

The previous prime is 91351103. The next prime is 91351111. The reversal of 91351109 is 90115319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49140100 + 42211009 = 7010^2 + 6497^2 .

It is a cyclic number.

It is not a de Polignac number, because 91351109 - 2¹⁶ = 91285573 is a prime.

Together with 91351111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91351103) 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, 45675554 + 45675555.

It is an arithmetic number, because the mean of its divisors is an integer number (45675555).

Almost surely, 2^91351109 is an apocalyptic number.

It is an amenable number.

91351109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91351109 is an equidigital number, since it uses as much as digits as its factorization.

91351109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 91351109 is about 9557.7774090005. Note that the first 3 decimals coincide. The cubic root of 91351109 is about 450.3718884645.

The spelling of 91351109 in words is "ninety-one million, three hundred fifty-one thousand, one hundred nine".