321920783 has 2 divisors, whose sum is σ = 321920784. Its totient is φ = 321920782.

The previous prime is 321920749. The next prime is 321920827. The reversal of 321920783 is 387029123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321920783 - 2¹⁴ = 321904399 is a prime.

It is a Chen prime.

It is equal to p_17373194 and since 321920783 and 17373194 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321920083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160960391 + 160960392.

It is an arithmetic number, because the mean of its divisors is an integer number (160960392).

Almost surely, 2^321920783 is an apocalyptic number.

321920783 is a deficient number, since it is larger than the sum of its proper divisors (1).

321920783 is an equidigital number, since it uses as much as digits as its factorization.

321920783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 321920783 is about 17942.1510137441. The cubic root of 321920783 is about 685.3561882088.

The spelling of 321920783 in words is "three hundred twenty-one million, nine hundred twenty thousand, seven hundred eighty-three".