152815721 has 2 divisors, whose sum is σ = 152815722. Its totient is φ = 152815720.

The previous prime is 152815717. The next prime is 152815739. The reversal of 152815721 is 127518251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103815721 + 49000000 = 10189^2 + 7000^2 .

It is a cyclic number.

It is not a de Polignac number, because 152815721 - 2² = 152815717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (152815781) 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, 76407860 + 76407861.

It is an arithmetic number, because the mean of its divisors is an integer number (76407861).

Almost surely, 2^152815721 is an apocalyptic number.

It is an amenable number.

152815721 is a deficient number, since it is larger than the sum of its proper divisors (1).

152815721 is an equidigital number, since it uses as much as digits as its factorization.

152815721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 32.

The square root of 152815721 is about 12361.8655954512. The cubic root of 152815721 is about 534.6333074044.

The spelling of 152815721 in words is "one hundred fifty-two million, eight hundred fifteen thousand, seven hundred twenty-one".