321690071 has 2 divisors, whose sum is σ = 321690072. Its totient is φ = 321690070.

The previous prime is 321690053. The next prime is 321690073. The reversal of 321690071 is 170096123.

It is a strong prime.

It is an emirp because it is prime and its reverse (170096123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321690071 - 2²² = 317495767 is a prime.

Together with 321690073, it forms a pair of twin primes.

It is a Chen prime.

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, 160845035 + 160845036.

It is an arithmetic number, because the mean of its divisors is an integer number (160845036).

Almost surely, 2^321690071 is an apocalyptic number.

321690071 is a deficient number, since it is larger than the sum of its proper divisors (1).

321690071 is an equidigital number, since it uses as much as digits as its factorization.

321690071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 321690071 is about 17935.7205319441. The cubic root of 321690071 is about 685.1924236082.

The spelling of 321690071 in words is "three hundred twenty-one million, six hundred ninety thousand, seventy-one".