75021601 has 2 divisors, whose sum is σ = 75021602. Its totient is φ = 75021600.

The previous prime is 75021599. The next prime is 75021619. The reversal of 75021601 is 10612057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59213025 + 15808576 = 7695^2 + 3976^2 .

It is a cyclic number.

It is not a de Polignac number, because 75021601 - 2¹ = 75021599 is a prime.

Together with 75021599, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75021691) 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, 37510800 + 37510801.

It is an arithmetic number, because the mean of its divisors is an integer number (37510801).

Almost surely, 2^75021601 is an apocalyptic number.

It is an amenable number.

75021601 is a deficient number, since it is larger than the sum of its proper divisors (1).

75021601 is an equidigital number, since it uses as much as digits as its factorization.

75021601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 75021601 is about 8661.5010823760. The cubic root of 75021601 is about 421.7568154068.

Adding to 75021601 its reverse (10612057), we get a palindrome (85633658).

The spelling of 75021601 in words is "seventy-five million, twenty-one thousand, six hundred one".