91332481 has 2 divisors, whose sum is σ = 91332482. Its totient is φ = 91332480.

The previous prime is 91332427. The next prime is 91332491. The reversal of 91332481 is 18423319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58384881 + 32947600 = 7641^2 + 5740^2 .

It is an emirp because it is prime and its reverse (18423319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91332481 is a prime.

It is a super-2 number, since 2×91332481² = 16683244171230722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91332401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45666240 + 45666241.

It is an arithmetic number, because the mean of its divisors is an integer number (45666241).

Almost surely, 2^91332481 is an apocalyptic number.

It is an amenable number.

91332481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91332481 is an equidigital number, since it uses as much as digits as its factorization.

91332481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 91332481 is about 9556.8028649753. The cubic root of 91332481 is about 450.3412736278.

The spelling of 91332481 in words is "ninety-one million, three hundred thirty-two thousand, four hundred eighty-one".