91420481 has 2 divisors, whose sum is σ = 91420482. Its totient is φ = 91420480.

The previous prime is 91420471. The next prime is 91420487. The reversal of 91420481 is 18402419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74114881 + 17305600 = 8609^2 + 4160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91420481 is a prime.

It is a super-2 number, since 2×91420481² = 16715408692542722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91420487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45710240 + 45710241.

It is an arithmetic number, because the mean of its divisors is an integer number (45710241).

Almost surely, 2^91420481 is an apocalyptic number.

It is an amenable number.

91420481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91420481 is an equidigital number, since it uses as much as digits as its factorization.

91420481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 91420481 is about 9561.4058066793. The cubic root of 91420481 is about 450.4858637029.

The spelling of 91420481 in words is "ninety-one million, four hundred twenty thousand, four hundred eighty-one".