1771147225 has 27 divisors (see below), whose sum is σ = 2323141023. Its totient is φ = 1339313040.

The previous prime is 1771147219. The next prime is 1771147229. The reversal of 1771147225 is 5227411771.

The square root of 1771147225 is 42085.

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., 637613001 + 1133534224 = 25251^2 + 33668^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1771147225 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1771147229) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 3997854 + ... + 3998296.

Almost surely, 2^1771147225 is an apocalyptic number.

1771147225 is the 42085-th square number.

1771147225 is the 21043-rd centered octagonal number.

It is an amenable number.

1771147225 is a deficient number, since it is larger than the sum of its proper divisors (551993798).

1771147225 is an frugal number, since it uses more digits than its factorization.

1771147225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 467 counting only the distinct ones).

The product of its digits is 27440, while the sum is 37.

The cubic root of 1771147225 is about 1209.9057880339.

Adding to 1771147225 its reverse (5227411771), we get a palindrome (6998558996).

It can be divided in two parts, 1771 and 147225, that added together give a square (148996 = 386²).

The spelling of 1771147225 in words is "one billion, seven hundred seventy-one million, one hundred forty-seven thousand, two hundred twenty-five".