91849151 has 2 divisors, whose sum is σ = 91849152. Its totient is φ = 91849150.

The previous prime is 91849141. The next prime is 91849171. The reversal of 91849151 is 15194819.

It is a weak prime.

It is an emirp because it is prime and its reverse (15194819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91849151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91849141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45924575 + 45924576.

It is an arithmetic number, because the mean of its divisors is an integer number (45924576).

Almost surely, 2^91849151 is an apocalyptic number.

91849151 is a deficient number, since it is larger than the sum of its proper divisors (1).

91849151 is an equidigital number, since it uses as much as digits as its factorization.

91849151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 38.

The square root of 91849151 is about 9583.7962728764. The cubic root of 91849151 is about 451.1888744024.

The spelling of 91849151 in words is "ninety-one million, eight hundred forty-nine thousand, one hundred fifty-one".