1311740781 has 16 divisors (see below), whose sum is σ = 1884704640. Its totient is φ = 806719680.

The previous prime is 1311740779. The next prime is 1311740821. The reversal of 1311740781 is 1870471131.

It is not a de Polignac number, because 1311740781 - 2¹ = 1311740779 is a prime.

It is a super-2 number, since 2×1311740781² = 3441327753076979922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311740711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58240 + ... + 77558.

It is an arithmetic number, because the mean of its divisors is an integer number (117794040).

Almost surely, 2^1311740781 is an apocalyptic number.

It is an amenable number.

1311740781 is a deficient number, since it is larger than the sum of its proper divisors (572963859).

1311740781 is a wasteful number, since it uses less digits than its factorization.

1311740781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21076.

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 1311740781 is about 36217.9621320692. The cubic root of 1311740781 is about 1094.6686322438.

The spelling of 1311740781 in words is "one billion, three hundred eleven million, seven hundred forty thousand, seven hundred eighty-one".