1213533045 has 12 divisors (see below), whose sum is σ = 2103457356. Its totient is φ = 647217600.

The previous prime is 1213533023. The next prime is 1213533071. The reversal of 1213533045 is 5403353121.

1213533045 is a `hidden beast` number, since 1 + 2 + 1 + 353 + 304 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 143065521 + 1070467524 = 11961^2 + 32718^2 .

It is not a de Polignac number, because 1213533045 - 2²⁴ = 1196755829 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13483656 + ... + 13483745.

It is an arithmetic number, because the mean of its divisors is an integer number (175288113).

Almost surely, 2^1213533045 is an apocalyptic number.

1213533045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213533045 is a deficient number, since it is larger than the sum of its proper divisors (889924311).

1213533045 is a wasteful number, since it uses less digits than its factorization.

1213533045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26967412 (or 26967409 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 1213533045 is about 34835.8011964703. The cubic root of 1213533045 is about 1066.6383696378.

Adding to 1213533045 its reverse (5403353121), we get a palindrome (6616886166).

The spelling of 1213533045 in words is "one billion, two hundred thirteen million, five hundred thirty-three thousand, forty-five".