1213220553 has 8 divisors (see below), whose sum is σ = 1618235808. Its totient is φ = 808509504.

The previous prime is 1213220549. The next prime is 1213220563. The reversal of 1213220553 is 3550223121.

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 1213220553 - 2² = 1213220549 is a prime.

It is a super-2 number, since 2×1213220553² = 2943808220443251618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213220513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66576 + ... + 82817.

It is an arithmetic number, because the mean of its divisors is an integer number (202279476).

Almost surely, 2^1213220553 is an apocalyptic number.

It is an amenable number.

1213220553 is a deficient number, since it is larger than the sum of its proper divisors (405015255).

1213220553 is a wasteful number, since it uses less digits than its factorization.

1213220553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152103.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1213220553 is about 34831.3156943576. The cubic root of 1213220553 is about 1066.5468065298.

Adding to 1213220553 its reverse (3550223121), we get a palindrome (4763443674).

The spelling of 1213220553 in words is "one billion, two hundred thirteen million, two hundred twenty thousand, five hundred fifty-three".