91929109 has 2 divisors, whose sum is σ = 91929110. Its totient is φ = 91929108.

The previous prime is 91929107. The next prime is 91929121. The reversal of 91929109 is 90192919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62062884 + 29866225 = 7878^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 91929109 - 2¹ = 91929107 is a prime.

It is a super-2 number, since 2×91929109² = 16901922163067762, which contains 22 as substring.

Together with 91929107, 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 (91929107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45964554 + 45964555.

It is an arithmetic number, because the mean of its divisors is an integer number (45964555).

Almost surely, 2^91929109 is an apocalyptic number.

It is an amenable number.

91929109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91929109 is an equidigital number, since it uses as much as digits as its factorization.

91929109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 91929109 is about 9587.9668856333. The cubic root of 91929109 is about 451.3197618272.

It can be divided in two parts, 9192910 and 9, that added together give a palindrome (9192919).

The spelling of 91929109 in words is "ninety-one million, nine hundred twenty-nine thousand, one hundred nine".