90988191 has 48 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 51500448.

The previous prime is 90988189. The next prime is 90988229. The reversal of 90988191 is 19188909.

It is not a de Polignac number, because 90988191 - 2¹ = 90988189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90988111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 253270 + ... + 253628.

It is an arithmetic number, because the mean of its divisors is an integer number (3276000).

Almost surely, 2^90988191 is an apocalyptic number.

90988191 is a deficient number, since it is larger than the sum of its proper divisors (66259809).

90988191 is a wasteful number, since it uses less digits than its factorization.

90988191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 90988191 is about 9538.7730343058. The cubic root of 90988191 is about 449.7746872058.

The spelling of 90988191 in words is "ninety million, nine hundred eighty-eight thousand, one hundred ninety-one".