91388123 has 2 divisors, whose sum is σ = 91388124. Its totient is φ = 91388122.

The previous prime is 91388083. The next prime is 91388183. The reversal of 91388123 is 32188319.

It is a weak prime.

It is an emirp because it is prime and its reverse (32188319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91388123 - 2⁸ = 91387867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91388183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45694061 + 45694062.

It is an arithmetic number, because the mean of its divisors is an integer number (45694062).

Almost surely, 2^91388123 is an apocalyptic number.

91388123 is a deficient number, since it is larger than the sum of its proper divisors (1).

91388123 is an equidigital number, since it uses as much as digits as its factorization.

91388123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 91388123 is about 9559.7135417334. The cubic root of 91388123 is about 450.4327080659.

The spelling of 91388123 in words is "ninety-one million, three hundred eighty-eight thousand, one hundred twenty-three".