1538381299225 has 9 divisors (see below), whose sum is σ = 1907600501023. Its totient is φ = 1230700078120.

The previous prime is 1538381299177. The next prime is 1538381299229. The reversal of 1538381299225 is 5229921838351.

The square root of 1538381299225 is 1240315.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 553817267721 + 984564031504 = 744189^2 + 992252^2 .

It is not a de Polignac number, because 1538381299225 - 2²³ = 1538372910617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538381299225.

It is not an unprimeable number, because it can be changed into a prime (1538381299229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6077544 + ... + 6325606.

Almost surely, 2^{1538381299225} is an apocalyptic number.

1538381299225 is the 1240315-th square number.

1538381299225 is the 620158-th centered octagonal number.

It is an amenable number.

1538381299225 is a deficient number, since it is larger than the sum of its proper divisors (369219201798).

1538381299225 is an frugal number, since it uses more digits than its factorization.

1538381299225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496136 (or 248068 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 58.

The spelling of 1538381299225 in words is "one trillion, five hundred thirty-eight billion, three hundred eighty-one million, two hundred ninety-nine thousand, two hundred twenty-five".