1220436001 has 4 divisors (see below), whose sum is σ = 1292226372. Its totient is φ = 1148645632.

The previous prime is 1220435999. The next prime is 1220436013. The reversal of 1220436001 is 1006340221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1006340221 = 9491 ⋅106031.

It can be written as a sum of positive squares in 2 ways, for example, as 889232400 + 331203601 = 29820^2 + 18199^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220436001 - 2¹ = 1220435999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220436001.

It is not an unprimeable number, because it can be changed into a prime (1220436031) 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, 35895160 + ... + 35895193.

It is an arithmetic number, because the mean of its divisors is an integer number (323056593).

Almost surely, 2^1220436001 is an apocalyptic number.

It is an amenable number.

1220436001 is a deficient number, since it is larger than the sum of its proper divisors (71790371).

1220436001 is an equidigital number, since it uses as much as digits as its factorization.

1220436001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71790370.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1220436001 is about 34934.7391717757. The cubic root of 1220436001 is about 1068.6570046143.

Adding to 1220436001 its reverse (1006340221), we get a palindrome (2226776222).

It can be divided in two parts, 12204 and 36001, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 1220436001 in words is "one billion, two hundred twenty million, four hundred thirty-six thousand, one".