321012761 has 2 divisors, whose sum is σ = 321012762. Its totient is φ = 321012760.

The previous prime is 321012701. The next prime is 321012763. The reversal of 321012761 is 167210123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320947225 + 65536 = 17915^2 + 256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321012761 is a prime.

Together with 321012763, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (321012763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160506380 + 160506381.

It is an arithmetic number, because the mean of its divisors is an integer number (160506381).

Almost surely, 2^321012761 is an apocalyptic number.

It is an amenable number.

321012761 is a deficient number, since it is larger than the sum of its proper divisors (1).

321012761 is an equidigital number, since it uses as much as digits as its factorization.

321012761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 321012761 is about 17916.8289884120. The cubic root of 321012761 is about 684.7112008289.

Adding to 321012761 its reverse (167210123), we get a palindrome (488222884).

The spelling of 321012761 in words is "three hundred twenty-one million, twelve thousand, seven hundred sixty-one".