990350609 has 4 divisors (see below), whose sum is σ = 1024500660. Its totient is φ = 956200560.

The previous prime is 990350573. The next prime is 990350681. The reversal of 990350609 is 906053099.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 342139009 + 648211600 = 18497^2 + 25460^2 .

It is a cyclic number.

It is not a de Polignac number, because 990350609 - 2²⁸ = 721915153 is a prime.

It is a super-5 number, since 5×990350609⁵ (a number of 46 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990352609) 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, 17074982 + ... + 17075039.

It is an arithmetic number, because the mean of its divisors is an integer number (256125165).

Almost surely, 2^990350609 is an apocalyptic number.

It is an amenable number.

990350609 is a deficient number, since it is larger than the sum of its proper divisors (34150051).

990350609 is a wasteful number, since it uses less digits than its factorization.

990350609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34150050.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 990350609 is about 31469.8364946499. The cubic root of 990350609 is about 996.7731348749.

The spelling of 990350609 in words is "nine hundred ninety million, three hundred fifty thousand, six hundred nine".