1211313605 has 8 divisors (see below), whose sum is σ = 1474049664. Its totient is φ = 955402000.

The previous prime is 1211313577. The next prime is 1211313611. The reversal of 1211313605 is 5063131121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211313605 - 2⁸ = 1211313349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1705721 + ... + 1706430.

It is an arithmetic number, because the mean of its divisors is an integer number (184256208).

Almost surely, 2^1211313605 is an apocalyptic number.

It is an amenable number.

1211313605 is a deficient number, since it is larger than the sum of its proper divisors (262736059).

1211313605 is an equidigital number, since it uses as much as digits as its factorization.

1211313605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412227.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1211313605 is about 34803.9308843125. The cubic root of 1211313605 is about 1065.9877117491.

Adding to 1211313605 its reverse (5063131121), we get a palindrome (6274444726).

The spelling of 1211313605 in words is "one billion, two hundred eleven million, three hundred thirteen thousand, six hundred five".