9090021550 has 48 divisors (see below), whose sum is σ = 18318394512. Its totient is φ = 3342528000.

The previous prime is 9090021541. The next prime is 9090021559. The reversal of 9090021550 is 551200909.

It is an interprime number because it is at equal distance from previous prime (9090021541) and next prime (9090021559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9090021559) 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 23 ways as a sum of consecutive naturals, for example, 87801 + ... + 160900.

It is an arithmetic number, because the mean of its divisors is an integer number (381633219).

Almost surely, 2^9090021550 is an apocalyptic number.

9090021550 is an abundant number, since it is smaller than the sum of its proper divisors (9228372962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9090021550 is a wasteful number, since it uses less digits than its factorization.

9090021550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248773 (or 248768 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 9090021550 is about 95341.6045071615. The cubic root of 9090021550 is about 2086.9961005405.

The spelling of 9090021550 in words is "nine billion, ninety million, twenty-one thousand, five hundred fifty".