152205721 has 2 divisors, whose sum is σ = 152205722. Its totient is φ = 152205720.

The previous prime is 152205701. The next prime is 152205733. The reversal of 152205721 is 127502251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 29550096 = 11075^2 + 5436^2 .

It is a cyclic number.

It is not a de Polignac number, because 152205721 - 2⁷ = 152205593 is a prime.

It is not a weakly prime, because it can be changed into another prime (152205701) 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, 76102860 + 76102861.

It is an arithmetic number, because the mean of its divisors is an integer number (76102861).

Almost surely, 2^152205721 is an apocalyptic number.

It is an amenable number.

152205721 is a deficient number, since it is larger than the sum of its proper divisors (1).

152205721 is an equidigital number, since it uses as much as digits as its factorization.

152205721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 152205721 is about 12337.1682731492. The cubic root of 152205721 is about 533.9209871078.

Adding to 152205721 its reverse (127502251), we get a palindrome (279707972).

The spelling of 152205721 in words is "one hundred fifty-two million, two hundred five thousand, seven hundred twenty-one".