91091129 has 2 divisors, whose sum is σ = 91091130. Its totient is φ = 91091128.

The previous prime is 91091081. The next prime is 91091137. The reversal of 91091129 is 92119019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85137529 + 5953600 = 9227^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 91091129 - 2¹² = 91087033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91091095 and 91091104.

It is not a weakly prime, because it can be changed into another prime (91091179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545564 + 45545565.

It is an arithmetic number, because the mean of its divisors is an integer number (45545565).

Almost surely, 2^91091129 is an apocalyptic number.

It is an amenable number.

91091129 is a deficient number, since it is larger than the sum of its proper divisors (1).

91091129 is an equidigital number, since it uses as much as digits as its factorization.

91091129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 91091129 is about 9544.1672764050. The cubic root of 91091129 is about 449.9442383581.

The spelling of 91091129 in words is "ninety-one million, ninety-one thousand, one hundred twenty-nine".