321250681 has 2 divisors, whose sum is σ = 321250682. Its totient is φ = 321250680.

The previous prime is 321250679. The next prime is 321250723. The reversal of 321250681 is 186052123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320732281 + 518400 = 17909^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 321250681 - 2¹ = 321250679 is a prime.

It is a super-2 number, since 2×321250681² = 206404000085927522, which contains 22 as substring.

Together with 321250679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (321250481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160625340 + 160625341.

It is an arithmetic number, because the mean of its divisors is an integer number (160625341).

Almost surely, 2^321250681 is an apocalyptic number.

It is an amenable number.

321250681 is a deficient number, since it is larger than the sum of its proper divisors (1).

321250681 is an equidigital number, since it uses as much as digits as its factorization.

321250681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 321250681 is about 17923.4673263853. The cubic root of 321250681 is about 684.8803179472.

The spelling of 321250681 in words is "three hundred twenty-one million, two hundred fifty thousand, six hundred eighty-one".