321610061 has 2 divisors, whose sum is σ = 321610062. Its totient is φ = 321610060.

The previous prime is 321610039. The next prime is 321610067. The reversal of 321610061 is 160016123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211149961 + 110460100 = 14531^2 + 10510^2 .

It is an emirp because it is prime and its reverse (160016123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321610061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321610067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160805030 + 160805031.

It is an arithmetic number, because the mean of its divisors is an integer number (160805031).

Almost surely, 2^321610061 is an apocalyptic number.

It is an amenable number.

321610061 is a deficient number, since it is larger than the sum of its proper divisors (1).

321610061 is an equidigital number, since it uses as much as digits as its factorization.

321610061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 321610061 is about 17933.4899280648. The cubic root of 321610061 is about 685.1356124138.

Adding to 321610061 its reverse (160016123), we get a palindrome (481626184).

The spelling of 321610061 in words is "three hundred twenty-one million, six hundred ten thousand, sixty-one".