1551553225 has 12 divisors (see below), whose sum is σ = 1924435980. Its totient is φ = 1240913600.

The previous prime is 1551553189. The next prime is 1551553247. The reversal of 1551553225 is 5223551551.

It can be written as a sum of positive squares in 6 ways, for example, as 205176976 + 1346376249 = 14324^2 + 36693^2 .

It is not a de Polignac number, because 1551553225 - 2⁹ = 1551552713 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 11 ways as a sum of consecutive naturals, for example, 141231 + ... + 151819.

It is an arithmetic number, because the mean of its divisors is an integer number (160369665).

Almost surely, 2^1551553225 is an apocalyptic number.

It is an amenable number.

1551553225 is a deficient number, since it is larger than the sum of its proper divisors (372882755).

1551553225 is a wasteful number, since it uses less digits than its factorization.

1551553225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16460 (or 16455 counting only the distinct ones).

The product of its digits is 37500, while the sum is 34.

The square root of 1551553225 is about 39389.7604080045. The cubic root of 1551553225 is about 1157.6809656930.

The spelling of 1551553225 in words is "one billion, five hundred fifty-one million, five hundred fifty-three thousand, two hundred twenty-five".