1213425305 has 4 divisors (see below), whose sum is σ = 1456110372. Its totient is φ = 970740240.

The previous prime is 1213425251. The next prime is 1213425319. The reversal of 1213425305 is 5035243121.

It is a happy number.

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 356341129 + 857084176 = 18877^2 + 29276^2 .

It is not a de Polignac number, because 1213425305 - 2⁸ = 1213425049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121342526 + ... + 121342535.

It is an arithmetic number, because the mean of its divisors is an integer number (364027593).

Almost surely, 2^1213425305 is an apocalyptic number.

It is an amenable number.

1213425305 is a deficient number, since it is larger than the sum of its proper divisors (242685067).

1213425305 is an equidigital number, since it uses as much as digits as its factorization.

1213425305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242685066.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1213425305 is about 34834.2547645274. The cubic root of 1213425305 is about 1066.6068025757.

Adding to 1213425305 its reverse (5035243121), we get a palindrome (6248668426).

The spelling of 1213425305 in words is "one billion, two hundred thirteen million, four hundred twenty-five thousand, three hundred five".