3777981913 has 2 divisors, whose sum is σ = 3777981914. Its totient is φ = 3777981912.

The previous prime is 3777981877. The next prime is 3777981943. The reversal of 3777981913 is 3191897773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2774866329 + 1003115584 = 52677^2 + 31672^2 .

It is a cyclic number.

It is not a de Polignac number, because 3777981913 - 2²⁹ = 3241111001 is a prime.

It is not a weakly prime, because it can be changed into another prime (3777981943) by changing a digit.

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 as a sum of consecutive naturals, namely, 1888990956 + 1888990957.

It is an arithmetic number, because the mean of its divisors is an integer number (1888990957).

Almost surely, 2^3777981913 is an apocalyptic number.

It is an amenable number.

3777981913 is a deficient number, since it is larger than the sum of its proper divisors (1).

3777981913 is an equidigital number, since it uses as much as digits as its factorization.

3777981913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 55.

The square root of 3777981913 is about 61465.2903108738. The cubic root of 3777981913 is about 1557.4709615013.

The spelling of 3777981913 in words is "three billion, seven hundred seventy-seven million, nine hundred eighty-one thousand, nine hundred thirteen".