331649173 has 2 divisors, whose sum is σ = 331649174. Its totient is φ = 331649172.

The previous prime is 331649113. The next prime is 331649281. The reversal of 331649173 is 371946133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258341329 + 73307844 = 16073^2 + 8562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331649173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331649113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165824586 + 165824587.

It is an arithmetic number, because the mean of its divisors is an integer number (165824587).

Almost surely, 2^331649173 is an apocalyptic number.

It is an amenable number.

331649173 is a deficient number, since it is larger than the sum of its proper divisors (1).

331649173 is an equidigital number, since it uses as much as digits as its factorization.

331649173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 331649173 is about 18211.2375471850. The cubic root of 331649173 is about 692.1915706096.

The spelling of 331649173 in words is "three hundred thirty-one million, six hundred forty-nine thousand, one hundred seventy-three".