1502472721 has 4 divisors (see below), whose sum is σ = 1506501172. Its totient is φ = 1498444272.

The previous prime is 1502472703. The next prime is 1502472737. The reversal of 1502472721 is 1272742051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 807412225 + 695060496 = 28415^2 + 26364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1502472721 - 2¹⁷ = 1502341649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1502472791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013666 + ... + 2014411.

It is an arithmetic number, because the mean of its divisors is an integer number (376625293).

Almost surely, 2^1502472721 is an apocalyptic number.

It is an amenable number.

1502472721 is a deficient number, since it is larger than the sum of its proper divisors (4028451).

1502472721 is an equidigital number, since it uses as much as digits as its factorization.

1502472721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028450.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 1502472721 is about 38761.7430077648. The cubic root of 1502472721 is about 1145.3429103301.

The spelling of 1502472721 in words is "one billion, five hundred two million, four hundred seventy-two thousand, seven hundred twenty-one".