75323921 has 2 divisors, whose sum is σ = 75323922. Its totient is φ = 75323920.

The previous prime is 75323909. The next prime is 75323947. The reversal of 75323921 is 12932357.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66650896 + 8673025 = 8164^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 75323921 - 2²⁶ = 8215057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (75323951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37661960 + 37661961.

It is an arithmetic number, because the mean of its divisors is an integer number (37661961).

Almost surely, 2^75323921 is an apocalyptic number.

It is an amenable number.

75323921 is a deficient number, since it is larger than the sum of its proper divisors (1).

75323921 is an equidigital number, since it uses as much as digits as its factorization.

75323921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 32.

The square root of 75323921 is about 8678.9354761975. The cubic root of 75323921 is about 422.3225841472.

The spelling of 75323921 in words is "seventy-five million, three hundred twenty-three thousand, nine hundred twenty-one".