1311381370 has 16 divisors (see below), whose sum is σ = 2542062600. Its totient is φ = 484202304.

The previous prime is 1311381367. The next prime is 1311381371. The reversal of 1311381370 is 731831131.

It is a Cunningham number, because it is equal to 36213²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 472062529 + 839318841 = 21727^2 + 28971^2 .

It is not an unprimeable number, because it can be changed into a prime (1311381371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5043645 + ... + 5043904.

Almost surely, 2^1311381370 is an apocalyptic number.

1311381370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311381370 is a deficient number, since it is larger than the sum of its proper divisors (1230681230).

1311381370 is a wasteful number, since it uses less digits than its factorization.

1311381370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10087569.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1311381370 is about 36213.0000138072. Note that the first 4 decimals coincide. The cubic root of 1311381370 is about 1094.5686450379.

The spelling of 1311381370 in words is "one billion, three hundred eleven million, three hundred eighty-one thousand, three hundred seventy".