1537721225 has 6 divisors (see below), whose sum is σ = 1906774350. Its totient is φ = 1230176960.

The previous prime is 1537721203. The next prime is 1537721239. The reversal of 1537721225 is 5221277351.

It can be written as a sum of positive squares in 3 ways, for example, as 131171209 + 1406550016 = 11453^2 + 37504^2 .

It is not a de Polignac number, because 1537721225 - 2¹⁶ = 1537655689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30754400 + ... + 30754449.

It is an arithmetic number, because the mean of its divisors is an integer number (317795725).

Almost surely, 2^1537721225 is an apocalyptic number.

It is an amenable number.

1537721225 is a deficient number, since it is larger than the sum of its proper divisors (369053125).

1537721225 is an equidigital number, since it uses as much as digits as its factorization.

1537721225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61508859 (or 61508854 counting only the distinct ones).

The product of its digits is 29400, while the sum is 35.

The square root of 1537721225 is about 39213.7887100953. The cubic root of 1537721225 is about 1154.2304738379.

Adding to 1537721225 its reverse (5221277351), we get a palindrome (6758998576).

The spelling of 1537721225 in words is "one billion, five hundred thirty-seven million, seven hundred twenty-one thousand, two hundred twenty-five".