75317431421 has 2 divisors, whose sum is σ = 75317431422. Its totient is φ = 75317431420.

The previous prime is 75317431393. The next prime is 75317431447. The reversal of 75317431421 is 12413471357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49068895225 + 26248536196 = 221515^2 + 162014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75317431421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75317431481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37658715710 + 37658715711.

It is an arithmetic number, because the mean of its divisors is an integer number (37658715711).

Almost surely, 2^75317431421 is an apocalyptic number.

It is an amenable number.

75317431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

75317431421 is an equidigital number, since it uses as much as digits as its factorization.

75317431421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The spelling of 75317431421 in words is "seventy-five billion, three hundred seventeen million, four hundred thirty-one thousand, four hundred twenty-one".