3118680781 has 2 divisors, whose sum is σ = 3118680782. Its totient is φ = 3118680780.

The previous prime is 3118680779. The next prime is 3118680797. The reversal of 3118680781 is 1870868113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1754855881 + 1363824900 = 41891^2 + 36930^2 .

It is a cyclic number.

It is not a de Polignac number, because 3118680781 - 2¹ = 3118680779 is a prime.

It is a super-2 number, since 2×3118680781² = 19452339627557539922, which contains 22 as substring.

Together with 3118680779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3118680701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1559340390 + 1559340391.

It is an arithmetic number, because the mean of its divisors is an integer number (1559340391).

Almost surely, 2^3118680781 is an apocalyptic number.

It is an amenable number.

3118680781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3118680781 is an equidigital number, since it uses as much as digits as its factorization.

3118680781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 3118680781 is about 55845.1500221819. The cubic root of 3118680781 is about 1461.0227369878.

The spelling of 3118680781 in words is "three billion, one hundred eighteen million, six hundred eighty thousand, seven hundred eighty-one".