331813109 has 4 divisors (see below), whose sum is σ = 337437120. Its totient is φ = 326189100.

The previous prime is 331813103. The next prime is 331813121. The reversal of 331813109 is 901318133.

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: 901318133 = 3083 ⋅292351.

It is a cyclic number.

It is not a de Polignac number, because 331813109 - 2¹² = 331809013 is a prime.

It is a super-2 number, since 2×331813109² = 220199878608491762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331813103) 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, 2811917 + ... + 2812034.

It is an arithmetic number, because the mean of its divisors is an integer number (84359280).

Almost surely, 2^331813109 is an apocalyptic number.

It is an amenable number.

331813109 is a deficient number, since it is larger than the sum of its proper divisors (5624011).

331813109 is an equidigital number, since it uses as much as digits as its factorization.

331813109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624010.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 331813109 is about 18215.7379482688. The cubic root of 331813109 is about 692.3056031824.

The spelling of 331813109 in words is "three hundred thirty-one million, eight hundred thirteen thousand, one hundred nine".