331727661 has 12 divisors (see below), whose sum is σ = 479428092. Its totient is φ = 221029056.

The previous prime is 331727639. The next prime is 331727687. The reversal of 331727661 is 166727133.

It can be written as a sum of positive squares in 2 ways, for example, as 104652900 + 227074761 = 10230^2 + 15069^2 .

It is not a de Polignac number, because 331727661 - 2¹⁸ = 331465517 is a prime.

It is a super-2 number, since 2×331727661² = 220086482145061842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331729661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8745 + ... + 27201.

It is an arithmetic number, because the mean of its divisors is an integer number (39952341).

Almost surely, 2^331727661 is an apocalyptic number.

It is an amenable number.

331727661 is a deficient number, since it is larger than the sum of its proper divisors (147700431).

331727661 is a wasteful number, since it uses less digits than its factorization.

331727661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460 (or 20457 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 331727661 is about 18213.3923528814. The cubic root of 331727661 is about 692.2461709234.

The spelling of 331727661 in words is "three hundred thirty-one million, seven hundred twenty-seven thousand, six hundred sixty-one".