321668149 has 16 divisors (see below), whose sum is σ = 356869440. Its totient is φ = 287487360.

The previous prime is 321668143. The next prime is 321668201. The reversal of 321668149 is 941866123.

It is a cyclic number.

It is not a de Polignac number, because 321668149 - 2²³ = 313279541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321668143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408334 + ... + 409120.

It is an arithmetic number, because the mean of its divisors is an integer number (22304340).

Almost surely, 2^321668149 is an apocalyptic number.

It is an amenable number.

321668149 is a deficient number, since it is larger than the sum of its proper divisors (35201291).

321668149 is a wasteful number, since it uses less digits than its factorization.

321668149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 62208, while the sum is 40.

The square root of 321668149 is about 17935.1093947040. The cubic root of 321668149 is about 685.1768588034.

The spelling of 321668149 in words is "three hundred twenty-one million, six hundred sixty-eight thousand, one hundred forty-nine".