3778319261 has 2 divisors, whose sum is σ = 3778319262. Its totient is φ = 3778319260.

The previous prime is 3778319219. The next prime is 3778319329. The reversal of 3778319261 is 1629138773.

3778319261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2363807161 + 1414512100 = 48619^2 + 37610^2 .

It is a cyclic number.

It is not a de Polignac number, because 3778319261 - 2¹⁰ = 3778318237 is a prime.

It is a super-2 number, since 2×3778319261² = 28551392876087172242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3778319761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1889159630 + 1889159631.

It is an arithmetic number, because the mean of its divisors is an integer number (1889159631).

Almost surely, 2^3778319261 is an apocalyptic number.

It is an amenable number.

3778319261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3778319261 is an equidigital number, since it uses as much as digits as its factorization.

3778319261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 3778319261 is about 61468.0344650779. The cubic root of 3778319261 is about 1557.5173172973.

The spelling of 3778319261 in words is "three billion, seven hundred seventy-eight million, three hundred nineteen thousand, two hundred sixty-one".