900090155 has 4 divisors (see below), whose sum is σ = 1080108192. Its totient is φ = 720072120.

The previous prime is 900090151. The next prime is 900090161. The reversal of 900090155 is 551090009.

900090155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 900090155 - 2² = 900090151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900090151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90009011 + ... + 90009020.

It is an arithmetic number, because the mean of its divisors is an integer number (270027048).

Almost surely, 2^900090155 is an apocalyptic number.

900090155 is a deficient number, since it is larger than the sum of its proper divisors (180018037).

900090155 is a wasteful number, since it uses less digits than its factorization.

900090155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180018036.

The product of its (nonzero) digits is 2025, while the sum is 29.

The square root of 900090155 is about 30001.5025457059. The cubic root of 900090155 is about 965.5216219350.

The spelling of 900090155 in words is "nine hundred million, ninety thousand, one hundred fifty-five".