93191281 has 2 divisors, whose sum is σ = 93191282. Its totient is φ = 93191280.

The previous prime is 93191279. The next prime is 93191291. The reversal of 93191281 is 18219139.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47831056 + 45360225 = 6916^2 + 6735^2 .

It is an emirp because it is prime and its reverse (18219139) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 93191281 - 2¹ = 93191279 is a prime.

It is a super-2 number, since 2×93191281² = 17369229708841922, which contains 22 as substring.

Together with 93191279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (93191201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46595640 + 46595641.

It is an arithmetic number, because the mean of its divisors is an integer number (46595641).

Almost surely, 2^93191281 is an apocalyptic number.

It is an amenable number.

93191281 is a deficient number, since it is larger than the sum of its proper divisors (1).

93191281 is an equidigital number, since it uses as much as digits as its factorization.

93191281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 93191281 is about 9653.5631245670. The cubic root of 93191281 is about 453.3758963185.

The spelling of 93191281 in words is "ninety-three million, one hundred ninety-one thousand, two hundred eighty-one".