990213109 has 4 divisors (see below), whose sum is σ = 991366720. Its totient is φ = 989059500.

The previous prime is 990213079. The next prime is 990213113. The reversal of 990213109 is 901312099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901312099 = 27077 ⋅33287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990213109 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 (990213209) 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, 575517 + ... + 577234.

It is an arithmetic number, because the mean of its divisors is an integer number (247841680).

Almost surely, 2^990213109 is an apocalyptic number.

It is an amenable number.

990213109 is a deficient number, since it is larger than the sum of its proper divisors (1153611).

990213109 is a wasteful number, since it uses less digits than its factorization.

990213109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153610.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 990213109 is about 31467.6517871925. The cubic root of 990213109 is about 996.7270021726.

The spelling of 990213109 in words is "nine hundred ninety million, two hundred thirteen thousand, one hundred nine".