75841721 has 2 divisors, whose sum is σ = 75841722. Its totient is φ = 75841720.

The previous prime is 75841679. The next prime is 75841729. The reversal of 75841721 is 12714857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 27678121 = 6940^2 + 5261^2 .

It is a cyclic number.

It is not a de Polignac number, because 75841721 - 2⁶ = 75841657 is a prime.

It is not a weakly prime, because it can be changed into another prime (75841729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37920860 + 37920861.

It is an arithmetic number, because the mean of its divisors is an integer number (37920861).

Almost surely, 2^75841721 is an apocalyptic number.

It is an amenable number.

75841721 is a deficient number, since it is larger than the sum of its proper divisors (1).

75841721 is an equidigital number, since it uses as much as digits as its factorization.

75841721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 75841721 is about 8708.7152324554. The cubic root of 75841721 is about 423.2881005811.

The spelling of 75841721 in words is "seventy-five million, eight hundred forty-one thousand, seven hundred twenty-one".