1551178225 has 9 divisors (see below), whose sum is σ = 1923705217. Its totient is φ = 1240785040.

The previous prime is 1551178219. The next prime is 1551178231. The reversal of 1551178225 is 5228711551.

The square root of 1551178225 is 39385.

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

It is an interprime number because it is at equal distance from previous prime (1551178219) and next prime (1551178231).

It can be written as a sum of positive squares in 4 ways, for example, as 391367089 + 1159811136 = 19783^2 + 34056^2 .

It is not a de Polignac number, because 1551178225 - 2¹⁵ = 1551145457 is a prime.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 192987 + ... + 200863.

Almost surely, 2^1551178225 is an apocalyptic number.

1551178225 is the 39385-th square number.

1551178225 is the 19693-rd centered octagonal number.

It is an amenable number.

1551178225 is a deficient number, since it is larger than the sum of its proper divisors (372526992).

1551178225 is an frugal number, since it uses more digits than its factorization.

1551178225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15764 (or 7882 counting only the distinct ones).

The product of its digits is 28000, while the sum is 37.

The cubic root of 1551178225 is about 1157.5876902717.

Adding to 1551178225 its reverse (5228711551), we get a palindrome (6779889776).

It can be divided in two parts, 1551 and 178225, that added together give a square (179776 = 424²).

The spelling of 1551178225 in words is "one billion, five hundred fifty-one million, one hundred seventy-eight thousand, two hundred twenty-five".