90154989 has 12 divisors (see below), whose sum is σ = 130306176. Its totient is φ = 60065352.

The previous prime is 90154979. The next prime is 90154991. The reversal of 90154989 is 98945109.

It is not a de Polignac number, because 90154989 - 2⁵ = 90154957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90154919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26884 + ... + 30050.

It is an arithmetic number, because the mean of its divisors is an integer number (10858848).

It is a vampire number, since it can be written as 9489 ⋅ 9501 (with its own digits).

Almost surely, 2^90154989 is an apocalyptic number.

It is an amenable number.

90154989 is a deficient number, since it is larger than the sum of its proper divisors (40151187).

90154989 is a wasteful number, since it uses less digits than its factorization.

90154989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336 (or 6333 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 90154989 is about 9494.9981042652. The cubic root of 90154989 is about 448.3975746986.

The spelling of 90154989 in words is "ninety million, one hundred fifty-four thousand, nine hundred eighty-nine".