91148389 has 2 divisors, whose sum is σ = 91148390. Its totient is φ = 91148388.

The previous prime is 91148329. The next prime is 91148419. The reversal of 91148389 is 98384119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79959364 + 11189025 = 8942^2 + 3345^2 .

It is an emirp because it is prime and its reverse (98384119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91148389 - 2¹⁷ = 91017317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91148329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45574194 + 45574195.

It is an arithmetic number, because the mean of its divisors is an integer number (45574195).

Almost surely, 2^91148389 is an apocalyptic number.

It is an amenable number.

91148389 is a deficient number, since it is larger than the sum of its proper divisors (1).

91148389 is an equidigital number, since it uses as much as digits as its factorization.

91148389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 91148389 is about 9547.1665430116. The cubic root of 91148389 is about 450.0384971180.

The spelling of 91148389 in words is "ninety-one million, one hundred forty-eight thousand, three hundred eighty-nine".