575161721 has 2 divisors, whose sum is σ = 575161722. Its totient is φ = 575161720.

The previous prime is 575161703. The next prime is 575161729. The reversal of 575161721 is 127161575.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492351721 + 82810000 = 22189^2 + 9100^2 .

It is a cyclic number.

It is not a de Polignac number, because 575161721 - 2¹⁰ = 575160697 is a prime.

It is a super-2 number, since 2×575161721² = 661622010607363682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (575161729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 287580860 + 287580861.

It is an arithmetic number, because the mean of its divisors is an integer number (287580861).

Almost surely, 2^575161721 is an apocalyptic number.

It is an amenable number.

575161721 is a deficient number, since it is larger than the sum of its proper divisors (1).

575161721 is an equidigital number, since it uses as much as digits as its factorization.

575161721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 35.

The square root of 575161721 is about 23982.5294954473. The cubic root of 575161721 is about 831.6297011739.

The spelling of 575161721 in words is "five hundred seventy-five million, one hundred sixty-one thousand, seven hundred twenty-one".