321696137 has 8 divisors (see below), whose sum is σ = 372307200. Its totient is φ = 272248704.

The previous prime is 321696121. The next prime is 321696149. The reversal of 321696137 is 731696123.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 321696137 - 2⁴ = 321696121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321696137.

It is not an unprimeable number, because it can be changed into a prime (321686137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290312 + ... + 291417.

It is an arithmetic number, because the mean of its divisors is an integer number (46538400).

Almost surely, 2^321696137 is an apocalyptic number.

It is an amenable number.

321696137 is a deficient number, since it is larger than the sum of its proper divisors (50611063).

321696137 is an equidigital number, since it uses as much as digits as its factorization.

321696137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581815.

The product of its digits is 40824, while the sum is 38.

The square root of 321696137 is about 17935.8896350307. The cubic root of 321696137 is about 685.1967303945.

The spelling of 321696137 in words is "three hundred twenty-one million, six hundred ninety-six thousand, one hundred thirty-seven".