1221481 has 4 divisors (see below), whose sum is σ = 1254532. Its totient is φ = 1188432.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221481 is 1841221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 672400 + 549081 = 820^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221481 - 2⁵ = 1221449 is a prime.

It is a super-4 number, since 4×1221481⁴ (a number of 25 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16470 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (313633).

2^1221481 is an apocalyptic number.

It is an amenable number.

1221481 is a deficient number, since it is larger than the sum of its proper divisors (33051).

1221481 is an equidigital number, since it uses as much as digits as its factorization.

1221481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33050.

The product of its digits is 128, while the sum is 19.

The square root of 1221481 is about 1105.2063155809. The cubic root of 1221481 is about 106.8961930317.

The spelling of 1221481 in words is "one million, two hundred twenty-one thousand, four hundred eighty-one".