3936555121 has 2 divisors, whose sum is σ = 3936555122. Its totient is φ = 3936555120.

The previous prime is 3936555101. The next prime is 3936555127. The reversal of 3936555121 is 1215556393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2923024225 + 1013530896 = 54065^2 + 31836^2 .

It is a cyclic number.

It is not a de Polignac number, because 3936555121 - 2¹⁷ = 3936424049 is a prime.

It is not a weakly prime, because it can be changed into another prime (3936555127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1968277560 + 1968277561.

It is an arithmetic number, because the mean of its divisors is an integer number (1968277561).

Almost surely, 2^3936555121 is an apocalyptic number.

It is an amenable number.

3936555121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3936555121 is an equidigital number, since it uses as much as digits as its factorization.

3936555121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 40.

The square root of 3936555121 is about 62741.9725622330. The cubic root of 3936555121 is about 1578.9635782924.

The spelling of 3936555121 in words is "three billion, nine hundred thirty-six million, five hundred fifty-five thousand, one hundred twenty-one".