331689987493 has 4 divisors (see below), whose sum is σ = 331856919520. Its totient is φ = 331523055468.

The previous prime is 331689987491. The next prime is 331689987511. The reversal of 331689987493 is 394789986133.

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.

It is a cyclic number.

It is not a de Polignac number, because 331689987493 - 2¹ = 331689987491 is a prime.

It is a super-2 number, since 2×331689987493² (a number of 24 digits) 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 (331689987491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83463033 + ... + 83467006.

It is an arithmetic number, because the mean of its divisors is an integer number (82964229880).

Almost surely, 2^331689987493 is an apocalyptic number.

It is an amenable number.

331689987493 is a deficient number, since it is larger than the sum of its proper divisors (166932027).

331689987493 is a wasteful number, since it uses less digits than its factorization.

331689987493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166932026.

The product of its digits is 211631616, while the sum is 70.

The spelling of 331689987493 in words is "three hundred thirty-one billion, six hundred eighty-nine million, nine hundred eighty-seven thousand, four hundred ninety-three".