1220154323 has 4 divisors (see below), whose sum is σ = 1262228640. Its totient is φ = 1178080008.

The previous prime is 1220154319. The next prime is 1220154337. The reversal of 1220154323 is 3234510221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3234510221 = 647 ⋅4999243.

It is a cyclic number.

It is not a de Polignac number, because 1220154323 - 2² = 1220154319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220154343) 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, 21037115 + ... + 21037172.

It is an arithmetic number, because the mean of its divisors is an integer number (315557160).

Almost surely, 2^1220154323 is an apocalyptic number.

1220154323 is a deficient number, since it is larger than the sum of its proper divisors (42074317).

1220154323 is an equidigital number, since it uses as much as digits as its factorization.

1220154323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42074316.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1220154323 is about 34930.7074506086. The cubic root of 1220154323 is about 1068.5747825426.

Adding to 1220154323 its reverse (3234510221), we get a palindrome (4454664544).

The spelling of 1220154323 in words is "one billion, two hundred twenty million, one hundred fifty-four thousand, three hundred twenty-three".