1213613705 has 4 divisors (see below), whose sum is σ = 1456336452. Its totient is φ = 970890960.

The previous prime is 1213613693. The next prime is 1213613707. The reversal of 1213613705 is 5073163121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 709476496 + 504137209 = 26636^2 + 22453^2 .

It is not a de Polignac number, because 1213613705 - 2⁴ = 1213613689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213613707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121361366 + ... + 121361375.

It is an arithmetic number, because the mean of its divisors is an integer number (364084113).

Almost surely, 2^1213613705 is an apocalyptic number.

It is an amenable number.

1213613705 is a deficient number, since it is larger than the sum of its proper divisors (242722747).

1213613705 is an equidigital number, since it uses as much as digits as its factorization.

1213613705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242722746.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1213613705 is about 34836.9588942548. The cubic root of 1213613705 is about 1066.6620012274.

Adding to 1213613705 its reverse (5073163121), we get a palindrome (6286776826).

The spelling of 1213613705 in words is "one billion, two hundred thirteen million, six hundred thirteen thousand, seven hundred five".