321051961 has 2 divisors, whose sum is σ = 321051962. Its totient is φ = 321051960.

The previous prime is 321051943. The next prime is 321051977. The reversal of 321051961 is 169150123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301196025 + 19855936 = 17355^2 + 4456^2 .

It is an emirp because it is prime and its reverse (169150123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321051961 - 2⁹ = 321051449 is a prime.

It is not a weakly prime, because it can be changed into another prime (321651961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160525980 + 160525981.

It is an arithmetic number, because the mean of its divisors is an integer number (160525981).

Almost surely, 2^321051961 is an apocalyptic number.

It is an amenable number.

321051961 is a deficient number, since it is larger than the sum of its proper divisors (1).

321051961 is an equidigital number, since it uses as much as digits as its factorization.

321051961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 321051961 is about 17917.9228985951. The cubic root of 321051961 is about 684.7390705275.

The spelling of 321051961 in words is "three hundred twenty-one million, fifty-one thousand, nine hundred sixty-one".