1221852025 has 9 divisors (see below), whose sum is σ = 1515313263. Its totient is φ = 977341800.

The previous prime is 1221852017. The next prime is 1221852059. The reversal of 1221852025 is 5202581221.

The square root of 1221852025 is 34955.

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., 439866729 + 781985296 = 20973^2 + 27964^2 .

It is not a de Polignac number, because 1221852025 - 2³ = 1221852017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221851984 and 1221852002.

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, 171280 + ... + 178270.

Almost surely, 2^1221852025 is an apocalyptic number.

1221852025 is the 34955-th square number.

1221852025 is the 17478-th centered octagonal number.

It is an amenable number.

1221852025 is a deficient number, since it is larger than the sum of its proper divisors (293461238).

1221852025 is an frugal number, since it uses more digits than its factorization.

1221852025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13992 (or 6996 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The cubic root of 1221852025 is about 1069.0701517982.

The spelling of 1221852025 in words is "one billion, two hundred twenty-one million, eight hundred fifty-two thousand, twenty-five".