1309472521 has 6 divisors (see below), whose sum is σ = 1523264010. Its totient is φ = 1122404976.

The previous prime is 1309472503. The next prime is 1309472561. The reversal of 1309472521 is 1252749031.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 768398400 + 541074121 = 27720^2 + 23261^2 .

It is not a de Polignac number, because 1309472521 - 2⁷ = 1309472393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309472561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13361916 + ... + 13362013.

It is an arithmetic number, because the mean of its divisors is an integer number (253877335).

Almost surely, 2^1309472521 is an apocalyptic number.

It is an amenable number.

1309472521 is a deficient number, since it is larger than the sum of its proper divisors (213791489).

1309472521 is an equidigital number, since it uses as much as digits as its factorization.

1309472521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26723943 (or 26723936 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1309472521 is about 36186.6345630538. The cubic root of 1309472521 is about 1094.0373018061.

The spelling of 1309472521 in words is "one billion, three hundred nine million, four hundred seventy-two thousand, five hundred twenty-one".