1212545555 has 16 divisors (see below), whose sum is σ = 1568778624. Its totient is φ = 894391680.

The previous prime is 1212545513. The next prime is 1212545557. The reversal of 1212545555 is 5555452121.

It is not a de Polignac number, because 1212545555 - 2⁶ = 1212545491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212545557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48977 + ... + 69453.

It is an arithmetic number, because the mean of its divisors is an integer number (98048664).

Almost surely, 2^1212545555 is an apocalyptic number.

1212545555 is a deficient number, since it is larger than the sum of its proper divisors (356233069).

1212545555 is a wasteful number, since it uses less digits than its factorization.

1212545555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21406.

The product of its digits is 50000, while the sum is 35.

The square root of 1212545555 is about 34821.6248184946. The cubic root of 1212545555 is about 1066.3489720652.

Adding to 1212545555 its reverse (5555452121), we get a palindrome (6767997676).

The spelling of 1212545555 in words is "one billion, two hundred twelve million, five hundred forty-five thousand, five hundred fifty-five".