75421001 has 2 divisors, whose sum is σ = 75421002. Its totient is φ = 75421000.

The previous prime is 75420953. The next prime is 75421009. The reversal of 75421001 is 10012457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50069776 + 25351225 = 7076^2 + 5035^2 .

It is a cyclic number.

It is not a de Polignac number, because 75421001 - 2²⁶ = 8312137 is a prime.

It is not a weakly prime, because it can be changed into another prime (75421009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37710500 + 37710501.

It is an arithmetic number, because the mean of its divisors is an integer number (37710501).

Almost surely, 2^75421001 is an apocalyptic number.

It is an amenable number.

75421001 is a deficient number, since it is larger than the sum of its proper divisors (1).

75421001 is an equidigital number, since it uses as much as digits as its factorization.

75421001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 75421001 is about 8684.5265271056. The cubic root of 75421001 is about 422.5039407683.

Adding to 75421001 its reverse (10012457), we get a palindrome (85433458).

The spelling of 75421001 in words is "seventy-five million, four hundred twenty-one thousand, one".