331613861 has 4 divisors (see below), whose sum is σ = 334656300. Its totient is φ = 328571424.

The previous prime is 331613857. The next prime is 331613899. The reversal of 331613861 is 168316133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168316133 = 17 ⋅9900949.

It can be written as a sum of positive squares in 2 ways, for example, as 144744961 + 186868900 = 12031^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 331613861 - 2² = 331613857 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 (331613561) 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, 1521056 + ... + 1521273.

It is an arithmetic number, because the mean of its divisors is an integer number (83664075).

Almost surely, 2^331613861 is an apocalyptic number.

It is an amenable number.

331613861 is a deficient number, since it is larger than the sum of its proper divisors (3042439).

331613861 is a wasteful number, since it uses less digits than its factorization.

331613861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042438.

The product of its digits is 7776, while the sum is 32.

The square root of 331613861 is about 18210.2680101090. The cubic root of 331613861 is about 692.1670029457.

Adding to 331613861 its reverse (168316133), we get a palindrome (499929994).

The spelling of 331613861 in words is "three hundred thirty-one million, six hundred thirteen thousand, eight hundred sixty-one".