1506721 has 2 divisors, whose sum is σ = 1506722. Its totient is φ = 1506720.

The previous prime is 1506697. The next prime is 1506731. The reversal of 1506721 is 1276051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 216225 = 1136^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1506721 - 2⁵ = 1506689 is a prime.

It is a super-3 number, since 3×1506721³ = 10261710980653330083, which contains 333 as substring.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 1506692 and 1506701.

It is not a weakly prime, because it can be changed into another prime (1506731) 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, 753360 + 753361.

It is an arithmetic number, because the mean of its divisors is an integer number (753361).

2^1506721 is an apocalyptic number.

It is an amenable number.

1506721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1506721 is an equidigital number, since it uses as much as digits as its factorization.

1506721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1506721 is about 1227.4856414639. The cubic root of 1506721 is about 114.6421389684.

The spelling of 1506721 in words is "one million, five hundred six thousand, seven hundred twenty-one".