1220528869 has 8 divisors (see below), whose sum is σ = 1439886848. Its totient is φ = 1012420080.

The previous prime is 1220528851. The next prime is 1220528893. The reversal of 1220528869 is 9688250221.

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

It is not a de Polignac number, because 1220528869 - 2¹¹ = 1220526821 is a prime.

It is a super-2 number, since 2×1220528869² = 2979381440124838322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220528819) 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, 2812062 + ... + 2812495.

It is an arithmetic number, because the mean of its divisors is an integer number (179985856).

Almost surely, 2^1220528869 is an apocalyptic number.

It is an amenable number.

1220528869 is a deficient number, since it is larger than the sum of its proper divisors (219357979).

1220528869 is an equidigital number, since it uses as much as digits as its factorization.

1220528869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624595.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1220528869 is about 34936.0683105584. The cubic root of 1220528869 is about 1068.6841100972.

The spelling of 1220528869 in words is "one billion, two hundred twenty million, five hundred twenty-eight thousand, eight hundred sixty-nine".