331087109 has 4 divisors (see below), whose sum is σ = 331975116. Its totient is φ = 330199104.

The previous prime is 331087091. The next prime is 331087111. The reversal of 331087109 is 901780133.

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 72199009 + 258888100 = 8497^2 + 16090^2 .

It is a cyclic number.

It is not a de Polignac number, because 331087109 - 2²⁸ = 62651653 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 (331087709) 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, 443444 + ... + 444189.

It is an arithmetic number, because the mean of its divisors is an integer number (82993779).

Almost surely, 2^331087109 is an apocalyptic number.

It is an amenable number.

331087109 is a deficient number, since it is larger than the sum of its proper divisors (888007).

331087109 is an equidigital number, since it uses as much as digits as its factorization.

331087109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888006.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 331087109 is about 18195.7992130052. The cubic root of 331087109 is about 691.8003178576.

The spelling of 331087109 in words is "three hundred thirty-one million, eighty-seven thousand, one hundred nine".