1221555083 has 8 divisors (see below), whose sum is σ = 1396419552. Its totient is φ = 1046779776.

The previous prime is 1221555079. The next prime is 1221555103. The reversal of 1221555083 is 3805551221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221555083 - 2² = 1221555079 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221555983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10241 + ... + 50477.

It is an arithmetic number, because the mean of its divisors is an integer number (174552444).

Almost surely, 2^1221555083 is an apocalyptic number.

1221555083 is a deficient number, since it is larger than the sum of its proper divisors (174864469).

1221555083 is an equidigital number, since it uses as much as digits as its factorization.

1221555083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44581.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 1221555083 is about 34950.7522522763. The cubic root of 1221555083 is about 1068.9835407786.

The spelling of 1221555083 in words is "one billion, two hundred twenty-one million, five hundred fifty-five thousand, eighty-three".