321491011 has 4 divisors (see below), whose sum is σ = 321697224. Its totient is φ = 321284800.

The previous prime is 321490999. The next prime is 321491021. The reversal of 321491011 is 110194123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321491011 - 2²¹ = 319393859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321491021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100750 + ... + 103891.

It is an arithmetic number, because the mean of its divisors is an integer number (80424306).

Almost surely, 2^321491011 is an apocalyptic number.

321491011 is a deficient number, since it is larger than the sum of its proper divisors (206213).

321491011 is a wasteful number, since it uses less digits than its factorization.

321491011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206212.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 321491011 is about 17930.1704119063. The cubic root of 321491011 is about 685.0510633786.

The spelling of 321491011 in words is "three hundred twenty-one million, four hundred ninety-one thousand, eleven".