90115901 has 8 divisors (see below), whose sum is σ = 90974208. Its totient is φ = 89262000.

The previous prime is 90115897. The next prime is 90115903. The reversal of 90115901 is 10951109.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90115901 - 2² = 90115897 is a prime.

It is a super-3 number, since 3×90115901³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 (90115903) 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 7 ways as a sum of consecutive naturals, for example, 50891 + ... + 52631.

It is an arithmetic number, because the mean of its divisors is an integer number (11371776).

Almost surely, 2^90115901 is an apocalyptic number.

It is an amenable number.

90115901 is a deficient number, since it is larger than the sum of its proper divisors (858307).

90115901 is a wasteful number, since it uses less digits than its factorization.

90115901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 90115901 is about 9492.9395342012. The cubic root of 90115901 is about 448.3327622454.

The spelling of 90115901 in words is "ninety million, one hundred fifteen thousand, nine hundred one".