331693669 has 2 divisors, whose sum is σ = 331693670. Its totient is φ = 331693668.

The previous prime is 331693667. The next prime is 331693673. The reversal of 331693669 is 966396133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193349025 + 138344644 = 13905^2 + 11762^2 .

It is an emirp because it is prime and its reverse (966396133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331693669 - 2¹ = 331693667 is a prime.

It is a super-2 number, since 2×331693669² = 220041380109363122, which contains 22 as substring.

Together with 331693667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331693667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165846834 + 165846835.

It is an arithmetic number, because the mean of its divisors is an integer number (165846835).

Almost surely, 2^331693669 is an apocalyptic number.

It is an amenable number.

331693669 is a deficient number, since it is larger than the sum of its proper divisors (1).

331693669 is an equidigital number, since it uses as much as digits as its factorization.

331693669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 46.

The square root of 331693669 is about 18212.4591694807. The cubic root of 331693669 is about 692.2225253869. Note that the first 3 decimals are identical.

The spelling of 331693669 in words is "three hundred thirty-one million, six hundred ninety-three thousand, six hundred sixty-nine".