1213572045 has 16 divisors (see below), whose sum is σ = 2219103360. Its totient is φ = 554775744.

The previous prime is 1213572037. The next prime is 1213572067. The reversal of 1213572045 is 5402753121.

It is not a de Polignac number, because 1213572045 - 2³ = 1213572037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5778810 + ... + 5779019.

It is an arithmetic number, because the mean of its divisors is an integer number (138693960).

Almost surely, 2^1213572045 is an apocalyptic number.

1213572045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213572045 is a deficient number, since it is larger than the sum of its proper divisors (1005531315).

1213572045 is a wasteful number, since it uses less digits than its factorization.

1213572045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11557844.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1213572045 is about 34836.3609609270. The cubic root of 1213572045 is about 1066.6497959029.

The spelling of 1213572045 in words is "one billion, two hundred thirteen million, five hundred seventy-two thousand, forty-five".