331688069 has 2 divisors, whose sum is σ = 331688070. Its totient is φ = 331688068.

The previous prime is 331688053. The next prime is 331688081. The reversal of 331688069 is 960886133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326235844 + 5452225 = 18062^2 + 2335^2 .

It is an emirp because it is prime and its reverse (960886133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331688069 - 2⁴ = 331688053 is a prime.

It is a super-2 number, since 2×331688069² = 220033950233897522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331688099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165844034 + 165844035.

It is an arithmetic number, because the mean of its divisors is an integer number (165844035).

Almost surely, 2^331688069 is an apocalyptic number.

It is an amenable number.

331688069 is a deficient number, since it is larger than the sum of its proper divisors (1).

331688069 is an equidigital number, since it uses as much as digits as its factorization.

331688069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 331688069 is about 18212.3054279243. The cubic root of 331688069 is about 692.2186297563.

The spelling of 331688069 in words is "three hundred thirty-one million, six hundred eighty-eight thousand, sixty-nine".