1220431553 has 8 divisors (see below), whose sum is σ = 1333545120. Its totient is φ = 1107678880.

The previous prime is 1220431549. The next prime is 1220431561. The reversal of 1220431553 is 3551340221.

It is a happy number.

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

It is not a de Polignac number, because 1220431553 - 2² = 1220431549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220431523) 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, 83123 + ... + 96696.

It is an arithmetic number, because the mean of its divisors is an integer number (166693140).

Almost surely, 2^1220431553 is an apocalyptic number.

It is an amenable number.

1220431553 is a deficient number, since it is larger than the sum of its proper divisors (113113567).

1220431553 is a wasteful number, since it uses less digits than its factorization.

1220431553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180447.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1220431553 is about 34934.6755101575. The cubic root of 1220431553 is about 1068.6557063373.

Adding to 1220431553 its reverse (3551340221), we get a palindrome (4771771774).

The spelling of 1220431553 in words is "one billion, two hundred twenty million, four hundred thirty-one thousand, five hundred fifty-three".