30990209903 has 4 divisors (see below), whose sum is σ = 30993327288. Its totient is φ = 30987092520.

The previous prime is 30990209837. The next prime is 30990209923.

30990209903 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30990209903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30990209923) 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, 1543733 + ... + 1563678.

It is an arithmetic number, because the mean of its divisors is an integer number (7748331822).

Almost surely, 2^30990209903 is an apocalyptic number.

30990209903 is a deficient number, since it is larger than the sum of its proper divisors (3117385).

30990209903 is an equidigital number, since it uses as much as digits as its factorization.

30990209903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117384.

The product of its (nonzero) digits is 118098, while the sum is 44.

The spelling of 30990209903 in words is "thirty billion, nine hundred ninety million, two hundred nine thousand, nine hundred three".