91948897 has 2 divisors, whose sum is σ = 91948898. Its totient is φ = 91948896.

The previous prime is 91948877. The next prime is 91948907. The reversal of 91948897 is 79884919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 12453841 = 8916^2 + 3529^2 .

It is an emirp because it is prime and its reverse (79884919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91948897 is a prime.

It is a super-3 number, since 3×91948897³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91948807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45974448 + 45974449.

It is an arithmetic number, because the mean of its divisors is an integer number (45974449).

Almost surely, 2^91948897 is an apocalyptic number.

It is an amenable number.

91948897 is a deficient number, since it is larger than the sum of its proper divisors (1).

91948897 is an equidigital number, since it uses as much as digits as its factorization.

91948897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 91948897 is about 9588.9987485660. The cubic root of 91948897 is about 451.3521421213.

The spelling of 91948897 in words is "ninety-one million, nine hundred forty-eight thousand, eight hundred ninety-seven".