1261433225 has 12 divisors (see below), whose sum is σ = 1684498956. Its totient is φ = 931519680.

The previous prime is 1261433219. The next prime is 1261433249. The reversal of 1261433225 is 5223341621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 176916601 + 1084516624 = 13301^2 + 32932^2 .

It is not a de Polignac number, because 1261433225 - 2³⁰ = 187691401 is a prime.

It is a super-2 number, since 2×1261433225² = 3182427562267801250, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 1940342 + ... + 1940991.

It is an arithmetic number, because the mean of its divisors is an integer number (140374913).

Almost surely, 2^1261433225 is an apocalyptic number.

It is an amenable number.

1261433225 is a deficient number, since it is larger than the sum of its proper divisors (423065731).

1261433225 is a wasteful number, since it uses less digits than its factorization.

1261433225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881356 (or 3881351 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 1261433225 is about 35516.6612310335. The cubic root of 1261433225 is about 1080.4916671395.

Adding to 1261433225 its reverse (5223341621), we get a palindrome (6484774846).

The spelling of 1261433225 in words is "one billion, two hundred sixty-one million, four hundred thirty-three thousand, two hundred twenty-five".