91008146 has 4 divisors (see below), whose sum is σ = 136512222. Its totient is φ = 45504072.

The previous prime is 91008143. The next prime is 91008173. The reversal of 91008146 is 64180019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64180019 = 797 ⋅80527.

It can be written as a sum of positive squares in only one way, i.e., 90992521 + 15625 = 9539^2 + 125^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91008143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22752035 + ... + 22752038.

Almost surely, 2^91008146 is an apocalyptic number.

91008146 is a deficient number, since it is larger than the sum of its proper divisors (45504076).

91008146 is a wasteful number, since it uses less digits than its factorization.

91008146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45504075.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 91008146 is about 9539.8189710287. The cubic root of 91008146 is about 449.8075654571.

The spelling of 91008146 in words is "ninety-one million, eight thousand, one hundred forty-six".