331155661 has 8 divisors (see below), whose sum is σ = 341409024. Its totient is φ = 320970960.

The previous prime is 331155593. The next prime is 331155673. The reversal of 331155661 is 166551133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 331155661 - 2¹³ = 331147469 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 (331153661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7285 + ... + 26746.

It is an arithmetic number, because the mean of its divisors is an integer number (42676128).

Almost surely, 2^331155661 is an apocalyptic number.

It is an amenable number.

331155661 is a deficient number, since it is larger than the sum of its proper divisors (10253363).

331155661 is a wasteful number, since it uses less digits than its factorization.

331155661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34331.

The product of its digits is 8100, while the sum is 31.

The square root of 331155661 is about 18197.6828470001. The cubic root of 331155661 is about 691.8480606030.

The spelling of 331155661 in words is "three hundred thirty-one million, one hundred fifty-five thousand, six hundred sixty-one".