321690053 has 2 divisors, whose sum is σ = 321690054. Its totient is φ = 321690052.

The previous prime is 321690001. The next prime is 321690071. The reversal of 321690053 is 350096123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296459524 + 25230529 = 17218^2 + 5023^2 .

It is a cyclic number.

It is not a de Polignac number, because 321690053 - 2²⁶ = 254581189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321689998 and 321690025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321690073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160845026 + 160845027.

It is an arithmetic number, because the mean of its divisors is an integer number (160845027).

Almost surely, 2^321690053 is an apocalyptic number.

It is an amenable number.

321690053 is a deficient number, since it is larger than the sum of its proper divisors (1).

321690053 is an equidigital number, since it uses as much as digits as its factorization.

321690053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 321690053 is about 17935.7200301521. The cubic root of 321690053 is about 685.1924108284.

The spelling of 321690053 in words is "three hundred twenty-one million, six hundred ninety thousand, fifty-three".