1220366401 has 4 divisors (see below), whose sum is σ = 1225430404. Its totient is φ = 1215302400.

The previous prime is 1220366377. The next prime is 1220366461. The reversal of 1220366401 is 1046630221.

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 892575376 + 327791025 = 29876^2 + 18105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220366401 - 2¹⁷ = 1220235329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220366461) 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, 2531640 + ... + 2532121.

It is an arithmetic number, because the mean of its divisors is an integer number (306357601).

Almost surely, 2^1220366401 is an apocalyptic number.

It is an amenable number.

1220366401 is a deficient number, since it is larger than the sum of its proper divisors (5064003).

1220366401 is an equidigital number, since it uses as much as digits as its factorization.

1220366401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064002.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1220366401 is about 34933.7430144552. The cubic root of 1220366401 is about 1068.6366894861.

Adding to 1220366401 its reverse (1046630221), we get a palindrome (2266996622).

The spelling of 1220366401 in words is "one billion, two hundred twenty million, three hundred sixty-six thousand, four hundred one".