1220355001 has 4 divisors (see below), whose sum is σ = 1221731712. Its totient is φ = 1218978292.

The previous prime is 1220354983. The next prime is 1220355011. The reversal of 1220355001 is 1005530221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220355001 - 2²¹ = 1218257849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220355001.

It is not an unprimeable number, because it can be changed into a prime (1220355011) 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, 687025 + ... + 688798.

It is an arithmetic number, because the mean of its divisors is an integer number (305432928).

Almost surely, 2^1220355001 is an apocalyptic number.

It is an amenable number.

1220355001 is a deficient number, since it is larger than the sum of its proper divisors (1376711).

1220355001 is an equidigital number, since it uses as much as digits as its factorization.

1220355001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376710.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1220355001 is about 34933.5798480488. The cubic root of 1220355001 is about 1068.6333619346.

Adding to 1220355001 its reverse (1005530221), we get a palindrome (2225885222).

The spelling of 1220355001 in words is "one billion, two hundred twenty million, three hundred fifty-five thousand, one".