91388441 has 2 divisors, whose sum is σ = 91388442. Its totient is φ = 91388440.

The previous prime is 91388417. The next prime is 91388443. The reversal of 91388441 is 14488319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 34762816 = 7525^2 + 5896^2 .

It is an emirp because it is prime and its reverse (14488319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91388441 - 2¹⁸ = 91126297 is a prime.

Together with 91388443, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 91388441 parts by 13519 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 91388395 and 91388404.

It is not a weakly prime, because it can be changed into another prime (91388443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45694220 + 45694221.

It is an arithmetic number, because the mean of its divisors is an integer number (45694221).

Almost surely, 2^91388441 is an apocalyptic number.

It is an amenable number.

91388441 is a deficient number, since it is larger than the sum of its proper divisors (1).

91388441 is an equidigital number, since it uses as much as digits as its factorization.

91388441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 91388441 is about 9559.7301740164. The cubic root of 91388441 is about 450.4332305168.

The spelling of 91388441 in words is "ninety-one million, three hundred eighty-eight thousand, four hundred forty-one".