331689101 has 2 divisors, whose sum is σ = 331689102. Its totient is φ = 331689100.

The previous prime is 331689089. The next prime is 331689109. The reversal of 331689101 is 101986133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252015625 + 79673476 = 15875^2 + 8926^2 .

It is an emirp because it is prime and its reverse (101986133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331689101 is a prime.

It is a super-2 number, since 2×331689101² = 220035319444376402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331689109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165844550 + 165844551.

It is an arithmetic number, because the mean of its divisors is an integer number (165844551).

Almost surely, 2^331689101 is an apocalyptic number.

It is an amenable number.

331689101 is a deficient number, since it is larger than the sum of its proper divisors (1).

331689101 is an equidigital number, since it uses as much as digits as its factorization.

331689101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 331689101 is about 18212.3337603944. Note that the first 3 decimals coincide. The cubic root of 331689101 is about 692.2193476687.

The spelling of 331689101 in words is "three hundred thirty-one million, six hundred eighty-nine thousand, one hundred one".