990155005 has 24 divisors (see below), whose sum is σ = 1385407800. Its totient is φ = 677376000.

The previous prime is 990155003. The next prime is 990155029. The reversal of 990155005 is 500551099.

990155005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40220964 + 949934041 = 6342^2 + 30821^2 .

It is not a de Polignac number, because 990155005 - 2¹ = 990155003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990155003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105505 + ... + 114505.

It is an arithmetic number, because the mean of its divisors is an integer number (57725325).

Almost surely, 2^990155005 is an apocalyptic number.

It is an amenable number.

990155005 is a deficient number, since it is larger than the sum of its proper divisors (395252795).

990155005 is a wasteful number, since it uses less digits than its factorization.

990155005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469 (or 9462 counting only the distinct ones).

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 990155005 is about 31466.7285398403. The cubic root of 990155005 is about 996.7075063832.

The spelling of 990155005 in words is "nine hundred ninety million, one hundred fifty-five thousand, five".