1213225555 has 8 divisors (see below), whose sum is σ = 1480546800. Its totient is φ = 954129696.

The previous prime is 1213225549. The next prime is 1213225577. The reversal of 1213225555 is 5555223121.

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 1213225555 - 2⁷ = 1213225427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2056020 + ... + 2056609.

It is an arithmetic number, because the mean of its divisors is an integer number (185068350).

Almost surely, 2^1213225555 is an apocalyptic number.

1213225555 is a deficient number, since it is larger than the sum of its proper divisors (267321245).

1213225555 is an equidigital number, since it uses as much as digits as its factorization.

1213225555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112693.

The product of its digits is 15000, while the sum is 31.

The square root of 1213225555 is about 34831.3874974857. The cubic root of 1213225555 is about 1066.5482722869.

Adding to 1213225555 its reverse (5555223121), we get a palindrome (6768448676).

The spelling of 1213225555 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, five hundred fifty-five".