3781262521 has 2 divisors, whose sum is σ = 3781262522. Its totient is φ = 3781262520.

The previous prime is 3781262501. The next prime is 3781262533. The reversal of 3781262521 is 1252621873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3491037225 + 290225296 = 59085^2 + 17036^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781262521 - 2⁵ = 3781262489 is a prime.

It is not a weakly prime, because it can be changed into another prime (3781262501) 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 as a sum of consecutive naturals, namely, 1890631260 + 1890631261.

It is an arithmetic number, because the mean of its divisors is an integer number (1890631261).

Almost surely, 2^3781262521 is an apocalyptic number.

It is an amenable number.

3781262521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781262521 is an equidigital number, since it uses as much as digits as its factorization.

3781262521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 3781262521 is about 61491.9711913677. The cubic root of 3781262521 is about 1557.9216406908.

The spelling of 3781262521 in words is "three billion, seven hundred eighty-one million, two hundred sixty-two thousand, five hundred twenty-one".