1353066721 has 2 divisors, whose sum is σ = 1353066722. Its totient is φ = 1353066720.

The previous prime is 1353066719. The next prime is 1353066739. The reversal of 1353066721 is 1276603531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830304225 + 522762496 = 28815^2 + 22864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353066721 - 2¹ = 1353066719 is a prime.

Together with 1353066719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1353066751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676533360 + 676533361.

It is an arithmetic number, because the mean of its divisors is an integer number (676533361).

Almost surely, 2^1353066721 is an apocalyptic number.

It is an amenable number.

1353066721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1353066721 is an equidigital number, since it uses as much as digits as its factorization.

1353066721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1353066721 is about 36784.0552549607. The cubic root of 1353066721 is about 1106.0456979332.

The spelling of 1353066721 in words is "one billion, three hundred fifty-three million, sixty-six thousand, seven hundred twenty-one".