1501420721 has 2 divisors, whose sum is σ = 1501420722. Its totient is φ = 1501420720.

The previous prime is 1501420709. The next prime is 1501420733. The reversal of 1501420721 is 1270241051.

It is a balanced prime because it is at equal distance from previous prime (1501420709) and next prime (1501420733).

It can be written as a sum of positive squares in only one way, i.e., 1269924496 + 231496225 = 35636^2 + 15215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1501420721 - 2¹⁴ = 1501404337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1501420751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750710360 + 750710361.

It is an arithmetic number, because the mean of its divisors is an integer number (750710361).

Almost surely, 2^1501420721 is an apocalyptic number.

It is an amenable number.

1501420721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1501420721 is an equidigital number, since it uses as much as digits as its factorization.

1501420721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1501420721 is about 38748.1705503628. The cubic root of 1501420721 is about 1145.0755328597.

Adding to 1501420721 its reverse (1270241051), we get a palindrome (2771661772).

The spelling of 1501420721 in words is "one billion, five hundred one million, four hundred twenty thousand, seven hundred twenty-one".