321123091 has 2 divisors, whose sum is σ = 321123092. Its totient is φ = 321123090.

The previous prime is 321123067. The next prime is 321123109. The reversal of 321123091 is 190321123.

Together with next prime (321123109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321123091 - 2⁹ = 321122579 is a prime.

It is not a weakly prime, because it can be changed into another prime (321123191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160561545 + 160561546.

It is an arithmetic number, because the mean of its divisors is an integer number (160561546).

Almost surely, 2^321123091 is an apocalyptic number.

321123091 is a deficient number, since it is larger than the sum of its proper divisors (1).

321123091 is an equidigital number, since it uses as much as digits as its factorization.

321123091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 321123091 is about 17919.9076727532. The cubic root of 321123091 is about 684.7896354406.

The spelling of 321123091 in words is "three hundred twenty-one million, one hundred twenty-three thousand, ninety-one".