1316007781 has 4 divisors (see below), whose sum is σ = 1435644864. Its totient is φ = 1196370700.

The previous prime is 1316007779. The next prime is 1316007799. The reversal of 1316007781 is 1877006131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1316007781 - 2¹ = 1316007779 is a prime.

It is a super-2 number, since 2×1316007781² = 3463752959305087922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316007731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59818525 + ... + 59818546.

It is an arithmetic number, because the mean of its divisors is an integer number (358911216).

Almost surely, 2^1316007781 is an apocalyptic number.

1316007781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1316007781 is a deficient number, since it is larger than the sum of its proper divisors (119637083).

1316007781 is a wasteful number, since it uses less digits than its factorization.

1316007781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119637082.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1316007781 is about 36276.8215393797. The cubic root of 1316007781 is about 1095.8543074160.

The spelling of 1316007781 in words is "one billion, three hundred sixteen million, seven thousand, seven hundred eighty-one".