1213225545 has 24 divisors (see below), whose sum is σ = 2258086464. Its totient is φ = 554617056.

The previous prime is 1213225543. The next prime is 1213225549. The reversal of 1213225545 is 5455223121.

It is not a de Polignac number, because 1213225545 - 2¹ = 1213225543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213225543) 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 23 ways as a sum of consecutive naturals, for example, 824589 + ... + 826058.

It is an arithmetic number, because the mean of its divisors is an integer number (94086936).

Almost surely, 2^1213225545 is an apocalyptic number.

1213225545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213225545 is a deficient number, since it is larger than the sum of its proper divisors (1044860919).

1213225545 is a wasteful number, since it uses less digits than its factorization.

1213225545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650669 (or 1650662 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 1213225545 is about 34831.3873539370. The cubic root of 1213225545 is about 1066.5482693565.

Adding to 1213225545 its reverse (5455223121), we get a palindrome (6668448666).

The spelling of 1213225545 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, five hundred forty-five".