1219953385225 has 9 divisors (see below), whose sum is σ = 1512749045703. Its totient is φ = 975958290120.

The previous prime is 1219953385193. The next prime is 1219953385247. The reversal of 1219953385225 is 5225833599121.

The square root of 1219953385225 is 1104515.

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., 439183218681 + 780770166544 = 662709^2 + 883612^2 .

It is not a de Polignac number, because 1219953385225 - 2⁵ = 1219953385193 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 (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5412124 + ... + 5633026.

Almost surely, 2^{1219953385225} is an apocalyptic number.

1219953385225 is the 1104515-th square number.

1219953385225 is the 552258-th centered octagonal number.

It is an amenable number.

1219953385225 is a deficient number, since it is larger than the sum of its proper divisors (292795660478).

1219953385225 is an frugal number, since it uses more digits than its factorization.

1219953385225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441816 (or 220908 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

The spelling of 1219953385225 in words is "one trillion, two hundred nineteen billion, nine hundred fifty-three million, three hundred eighty-five thousand, two hundred twenty-five".