331465661 has 4 divisors (see below), whose sum is σ = 332511612. Its totient is φ = 330419712.

The previous prime is 331465649. The next prime is 331465663. The reversal of 331465661 is 166564133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166564133 = 1723 ⋅96671.

It can be written as a sum of positive squares in 2 ways, for example, as 19272100 + 312193561 = 4390^2 + 17669^2 .

It is a cyclic number.

It is not a de Polignac number, because 331465661 - 2¹⁴ = 331449277 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 (331465663) 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, 522500 + ... + 523133.

It is an arithmetic number, because the mean of its divisors is an integer number (83127903).

Almost surely, 2^331465661 is an apocalyptic number.

It is an amenable number.

331465661 is a deficient number, since it is larger than the sum of its proper divisors (1045951).

331465661 is a wasteful number, since it uses less digits than its factorization.

331465661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045950.

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

The square root of 331465661 is about 18206.1984225153. The cubic root of 331465661 is about 692.0638765420.

The spelling of 331465661 in words is "three hundred thirty-one million, four hundred sixty-five thousand, six hundred sixty-one".