1220505523 has 8 divisors (see below), whose sum is σ = 1238924480. Its totient is φ = 1202160960.

The previous prime is 1220505521. The next prime is 1220505551. The reversal of 1220505523 is 3255050221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220505523 - 2¹ = 1220505521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220505521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14911 + ... + 51607.

It is an arithmetic number, because the mean of its divisors is an integer number (154865560).

Almost surely, 2^1220505523 is an apocalyptic number.

1220505523 is a deficient number, since it is larger than the sum of its proper divisors (18418957).

1220505523 is an equidigital number, since it uses as much as digits as its factorization.

1220505523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37197.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1220505523 is about 34935.7341843563. The cubic root of 1220505523 is about 1068.6772962045.

Adding to 1220505523 its reverse (3255050221), we get a palindrome (4475555744).

The spelling of 1220505523 in words is "one billion, two hundred twenty million, five hundred five thousand, five hundred twenty-three".