53329721 has 2 divisors, whose sum is σ = 53329722. Its totient is φ = 53329720.

The previous prime is 53329699. The next prime is 53329747. The reversal of 53329721 is 12792335.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 6817321 = 6820^2 + 2611^2 .

It is a cyclic number.

It is not a de Polignac number, because 53329721 - 2⁶ = 53329657 is a prime.

It is a super-3 number, since 3×53329721³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53329421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26664860 + 26664861.

It is an arithmetic number, because the mean of its divisors is an integer number (26664861).

Almost surely, 2^53329721 is an apocalyptic number.

It is an amenable number.

53329721 is a deficient number, since it is larger than the sum of its proper divisors (1).

53329721 is an equidigital number, since it uses as much as digits as its factorization.

53329721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 32.

The square root of 53329721 is about 7302.7201096578. The cubic root of 53329721 is about 376.4059130210.

The spelling of 53329721 in words is "fifty-three million, three hundred twenty-nine thousand, seven hundred twenty-one".