3781534639 has 2 divisors, whose sum is σ = 3781534640. Its totient is φ = 3781534638.

The previous prime is 3781534619. The next prime is 3781534651. The reversal of 3781534639 is 9364351873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3781534639 - 2⁵ = 3781534607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3781534592 and 3781534601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781534609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890767319 + 1890767320.

It is an arithmetic number, because the mean of its divisors is an integer number (1890767320).

Almost surely, 2^3781534639 is an apocalyptic number.

3781534639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781534639 is an equidigital number, since it uses as much as digits as its factorization.

3781534639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 49.

The square root of 3781534639 is about 61494.1837818830. The cubic root of 3781534639 is about 1557.9590116614.

The spelling of 3781534639 in words is "three billion, seven hundred eighty-one million, five hundred thirty-four thousand, six hundred thirty-nine".