1500721601 has 2 divisors, whose sum is σ = 1500721602. Its totient is φ = 1500721600.

The previous prime is 1500721583. The next prime is 1500721613. The reversal of 1500721601 is 1061270051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1393080976 + 107640625 = 37324^2 + 10375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1500721601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1500727601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750360800 + 750360801.

It is an arithmetic number, because the mean of its divisors is an integer number (750360801).

Almost surely, 2^1500721601 is an apocalyptic number.

It is an amenable number.

1500721601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500721601 is an equidigital number, since it uses as much as digits as its factorization.

1500721601 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 23.

The square root of 1500721601 is about 38739.1481708104. The cubic root of 1500721601 is about 1144.8977746687.

Adding to 1500721601 its reverse (1061270051), we get a palindrome (2561991652).

The spelling of 1500721601 in words is "one billion, five hundred million, seven hundred twenty-one thousand, six hundred one".