1220204451 has 8 divisors (see below), whose sum is σ = 1630647040. Its totient is φ = 811615752.

The previous prime is 1220204431. The next prime is 1220204467. The reversal of 1220204451 is 1544020221.

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

It is not a de Polignac number, because 1220204451 - 2¹³ = 1220196259 is a prime.

It is a super-2 number, since 2×1220204451² = 2977797804480422802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220204431) 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, 461935 + ... + 464568.

It is an arithmetic number, because the mean of its divisors is an integer number (203830880).

Almost surely, 2^1220204451 is an apocalyptic number.

1220204451 is a deficient number, since it is larger than the sum of its proper divisors (410442589).

1220204451 is an equidigital number, since it uses as much as digits as its factorization.

1220204451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926945.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1220204451 is about 34931.4249780910. The cubic root of 1220204451 is about 1068.5894158782.

Adding to 1220204451 its reverse (1544020221), we get a palindrome (2764224672).

The spelling of 1220204451 in words is "one billion, two hundred twenty million, two hundred four thousand, four hundred fifty-one".