1539981225 has 36 divisors (see below), whose sum is σ = 2765708400. Its totient is φ = 819110880.

The previous prime is 1539981211. The next prime is 1539981241. The reversal of 1539981225 is 5221899351.

1539981225 is a `hidden beast` number, since 1 + 539 + 98 + 1 + 2 + 25 = 666.

It is not a de Polignac number, because 1539981225 - 2⁹ = 1539980713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

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 in 35 ways as a sum of consecutive naturals, for example, 76246 + ... + 94304.

Almost surely, 2^1539981225 is an apocalyptic number.

1539981225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1539981225 is a deficient number, since it is larger than the sum of its proper divisors (1225727175).

1539981225 is a wasteful number, since it uses less digits than its factorization.

1539981225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18454 (or 18446 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 1539981225 is about 39242.5945243176. The cubic root of 1539981225 is about 1154.7956573338.

The spelling of 1539981225 in words is "one billion, five hundred thirty-nine million, nine hundred eighty-one thousand, two hundred twenty-five".