1216963225 has 9 divisors (see below), whose sum is σ = 1509250717. Its totient is φ = 973431040.

The previous prime is 1216963211. The next prime is 1216963259. The reversal of 1216963225 is 5223696121.

The square root of 1216963225 is 34885.

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

It can be written as a sum of positive squares in 4 ways, for example, as 245768329 + 971194896 = 15677^2 + 31164^2 .

It is not a de Polignac number, because 1216963225 - 2⁵ = 1216963193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 170937 + ... + 177913.

Almost surely, 2^1216963225 is an apocalyptic number.

1216963225 is the 34885-th square number.

1216963225 is the 17443-rd centered octagonal number.

It is an amenable number.

1216963225 is a deficient number, since it is larger than the sum of its proper divisors (292287492).

1216963225 is an frugal number, since it uses more digits than its factorization.

1216963225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13964 (or 6982 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The cubic root of 1216963225 is about 1067.6424130872.

The spelling of 1216963225 in words is "one billion, two hundred sixteen million, nine hundred sixty-three thousand, two hundred twenty-five".