1221662450 has 18 divisors (see below), whose sum is σ = 2272751949. Its totient is φ = 488566120.

The previous prime is 1221662443. The next prime is 1221662459. The reversal of 1221662450 is 542661221.

It can be written as a sum of positive squares in 2 ways, for example, as 1197229201 + 24433249 = 34601^2 + 4943^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24715.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221662459) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 244679 + ... + 249621.

Almost surely, 2^1221662450 is an apocalyptic number.

1221662450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221662450 is a deficient number, since it is larger than the sum of its proper divisors (1051089499).

1221662450 is an frugal number, since it uses more digits than its factorization.

1221662450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9898 (or 4950 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1221662450 is about 34952.2881940510. The cubic root of 1221662450 is about 1069.0148588351.

The spelling of 1221662450 in words is "one billion, two hundred twenty-one million, six hundred sixty-two thousand, four hundred fifty".