91430189 has 2 divisors, whose sum is σ = 91430190. Its totient is φ = 91430188.

The previous prime is 91430173. The next prime is 91430201. The reversal of 91430189 is 98103419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 37920964 = 7315^2 + 6158^2 .

It is a cyclic number.

It is not a de Polignac number, because 91430189 - 2⁴ = 91430173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91430089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715094 + 45715095.

It is an arithmetic number, because the mean of its divisors is an integer number (45715095).

Almost surely, 2^91430189 is an apocalyptic number.

It is an amenable number.

91430189 is a deficient number, since it is larger than the sum of its proper divisors (1).

91430189 is an equidigital number, since it uses as much as digits as its factorization.

91430189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 91430189 is about 9561.9134591357. The cubic root of 91430189 is about 450.5018089336.

It can be divided in two parts, 91430 and 189, that added together give a palindrome (91619).

The spelling of 91430189 in words is "ninety-one million, four hundred thirty thousand, one hundred eighty-nine".