30990609 has 24 divisors (see below), whose sum is σ = 51046632. Its totient is φ = 17948160.

The previous prime is 30990593. The next prime is 30990611. The reversal of 30990609 is 90609903.

It can be written as a sum of positive squares in 4 ways, for example, as 1830609 + 29160000 = 1353^2 + 5400^2 .

It is not a de Polignac number, because 30990609 - 2⁴ = 30990593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30990679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5802 + ... + 9779.

It is an arithmetic number, because the mean of its divisors is an integer number (2126943).

Almost surely, 2^30990609 is an apocalyptic number.

30990609 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

30990609 is a deficient number, since it is larger than the sum of its proper divisors (20056023).

30990609 is a wasteful number, since it uses less digits than its factorization.

30990609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15617 (or 15614 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 30990609 is about 5566.9209622555. The cubic root of 30990609 is about 314.1063408465.

The spelling of 30990609 in words is "thirty million, nine hundred ninety thousand, six hundred nine".