331665461 has 4 divisors (see below), whose sum is σ = 351175212. Its totient is φ = 312155712.

The previous prime is 331665449. The next prime is 331665469. The reversal of 331665461 is 164566133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164566133 = 449 ⋅366517.

It can be written as a sum of positive squares in 2 ways, for example, as 251222500 + 80442961 = 15850^2 + 8969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331665461 is a prime.

It is a super-2 number, since 2×331665461² = 220003956040685042, 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 (331665469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9754850 + ... + 9754883.

It is an arithmetic number, because the mean of its divisors is an integer number (87793803).

Almost surely, 2^331665461 is an apocalyptic number.

It is an amenable number.

331665461 is a deficient number, since it is larger than the sum of its proper divisors (19509751).

331665461 is a wasteful number, since it uses less digits than its factorization.

331665461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19509750.

The product of its digits is 38880, while the sum is 35.

The square root of 331665461 is about 18211.6847381015. The cubic root of 331665461 is about 692.2029020935.

The spelling of 331665461 in words is "three hundred thirty-one million, six hundred sixty-five thousand, four hundred sixty-one".