321993131 has 4 divisors (see below), whose sum is σ = 329846664. Its totient is φ = 314139600.

The previous prime is 321993127. The next prime is 321993143. The reversal of 321993131 is 131399123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131399123 = 7573 ⋅17351.

It is a cyclic number.

It is not a de Polignac number, because 321993131 - 2² = 321993127 is a prime.

It is a super-2 number, since 2×321993131² = 207359152822366322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321993101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926705 + ... + 3926786.

It is an arithmetic number, because the mean of its divisors is an integer number (82461666).

Almost surely, 2^321993131 is an apocalyptic number.

321993131 is a deficient number, since it is larger than the sum of its proper divisors (7853533).

321993131 is an equidigital number, since it uses as much as digits as its factorization.

321993131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7853532.

The product of its digits is 4374, while the sum is 32.

The square root of 321993131 is about 17944.1670467035. The cubic root of 321993131 is about 685.4075263414.

The spelling of 321993131 in words is "three hundred twenty-one million, nine hundred ninety-three thousand, one hundred thirty-one".