90990149 has 4 divisors (see below), whose sum is σ = 91187136. Its totient is φ = 90793164.

The previous prime is 90990131. The next prime is 90990157. The reversal of 90990149 is 94109909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94109909 = 17 ⋅5535877.

It is a cyclic number.

It is not a de Polignac number, because 90990149 - 2⁸ = 90989893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90990049) 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 in 3 ways as a sum of consecutive naturals, for example, 97799 + ... + 98724.

It is an arithmetic number, because the mean of its divisors is an integer number (22796784).

Almost surely, 2^90990149 is an apocalyptic number.

It is an amenable number.

90990149 is a deficient number, since it is larger than the sum of its proper divisors (196987).

90990149 is a wasteful number, since it uses less digits than its factorization.

90990149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196986.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 90990149 is about 9538.8756674988. The cubic root of 90990149 is about 449.7779134579. Note that the first 3 decimals are identical.

The spelling of 90990149 in words is "ninety million, nine hundred ninety thousand, one hundred forty-nine".