75721141 has 2 divisors, whose sum is σ = 75721142. Its totient is φ = 75721140.

The previous prime is 75721109. The next prime is 75721147. The reversal of 75721141 is 14112757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 20738916 = 7415^2 + 4554^2 .

It is an emirp because it is prime and its reverse (14112757) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75721141 - 2⁵ = 75721109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75721147) 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, 37860570 + 37860571.

It is an arithmetic number, because the mean of its divisors is an integer number (37860571).

Almost surely, 2^75721141 is an apocalyptic number.

It is an amenable number.

75721141 is a deficient number, since it is larger than the sum of its proper divisors (1).

75721141 is an equidigital number, since it uses as much as digits as its factorization.

75721141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1960, while the sum is 28.

The square root of 75721141 is about 8701.7895285970. The cubic root of 75721141 is about 423.0636544065.

Adding to 75721141 its reverse (14112757), we get a palindrome (89833898).

The spelling of 75721141 in words is "seventy-five million, seven hundred twenty-one thousand, one hundred forty-one".