1311620826 has 8 divisors (see below), whose sum is σ = 2623241664. Its totient is φ = 437206940.

The previous prime is 1311620809. The next prime is 1311620867. The reversal of 1311620826 is 6280261131.

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

1311620826 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1311620793 and 1311620802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109301730 + ... + 109301741.

It is an arithmetic number, because the mean of its divisors is an integer number (327905208).

Almost surely, 2^1311620826 is an apocalyptic number.

1311620826 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311620826 is a wasteful number, since it uses less digits than its factorization.

1311620826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218603476.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1311620826 is about 36216.3060788921. The cubic root of 1311620826 is about 1094.6352631055.

Adding to 1311620826 its reverse (6280261131), we get a palindrome (7591881957).

The spelling of 1311620826 in words is "one billion, three hundred eleven million, six hundred twenty thousand, eight hundred twenty-six".