1213072805 has 16 divisors (see below), whose sum is σ = 1683690624. Its totient is φ = 821797440.

The previous prime is 1213072753. The next prime is 1213072823. The reversal of 1213072805 is 5082703121.

It is a de Polignac number, because none of the positive numbers 2^k-1213072805 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, 205886 + ... + 211695.

It is an arithmetic number, because the mean of its divisors is an integer number (105230664).

Almost surely, 2^1213072805 is an apocalyptic number.

It is an amenable number.

1213072805 is a deficient number, since it is larger than the sum of its proper divisors (470617819).

1213072805 is an equidigital number, since it uses as much as digits as its factorization.

1213072805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417676.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1213072805 is about 34829.1947222442. The cubic root of 1213072805 is about 1066.5035094957.

Adding to 1213072805 its reverse (5082703121), we get a palindrome (6295775926).

The spelling of 1213072805 in words is "one billion, two hundred thirteen million, seventy-two thousand, eight hundred five".