3826131721 has 2 divisors, whose sum is σ = 3826131722. Its totient is φ = 3826131720.

The previous prime is 3826131691. The next prime is 3826131737. The reversal of 3826131721 is 1271316283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3129171721 + 696960000 = 55939^2 + 26400^2 .

It is a cyclic number.

It is not a de Polignac number, because 3826131721 - 2¹⁵ = 3826098953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3826131761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1913065860 + 1913065861.

It is an arithmetic number, because the mean of its divisors is an integer number (1913065861).

Almost surely, 2^3826131721 is an apocalyptic number.

It is an amenable number.

3826131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3826131721 is an equidigital number, since it uses as much as digits as its factorization.

3826131721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 3826131721 is about 61855.7331295976. The cubic root of 3826131721 is about 1564.0596270299.

The spelling of 3826131721 in words is "three billion, eight hundred twenty-six million, one hundred thirty-one thousand, seven hundred twenty-one".