331323134521 has 4 divisors (see below), whose sum is σ = 333355791952. Its totient is φ = 329290477092.

The previous prime is 331323134503. The next prime is 331323134587. The reversal of 331323134521 is 125431323133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125431323133 = 27427 ⋅4573279.

It is a cyclic number.

It is not a de Polignac number, because 331323134521 - 2⁵ = 331323134489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331323134221) 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, 1016328471 + ... + 1016328796.

It is an arithmetic number, because the mean of its divisors is an integer number (83338947988).

Almost surely, 2^331323134521 is an apocalyptic number.

It is an amenable number.

331323134521 is a deficient number, since it is larger than the sum of its proper divisors (2032657431).

331323134521 is a wasteful number, since it uses less digits than its factorization.

331323134521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032657430.

The product of its digits is 19440, while the sum is 31.

Adding to 331323134521 its reverse (125431323133), we get a palindrome (456754457654).

The spelling of 331323134521 in words is "three hundred thirty-one billion, three hundred twenty-three million, one hundred thirty-four thousand, five hundred twenty-one".