3952243681 has 2 divisors, whose sum is σ = 3952243682. Its totient is φ = 3952243680.

The previous prime is 3952243651. The next prime is 3952243693. The reversal of 3952243681 is 1863422593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3473334225 + 478909456 = 58935^2 + 21884^2 .

It is an emirp because it is prime and its reverse (1863422593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3952243681 - 2⁷ = 3952243553 is a prime.

It is a super-2 number, since 2×3952243681² = 31240460228008859522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3952243601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1976121840 + 1976121841.

It is an arithmetic number, because the mean of its divisors is an integer number (1976121841).

Almost surely, 2^3952243681 is an apocalyptic number.

It is an amenable number.

3952243681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3952243681 is an equidigital number, since it uses as much as digits as its factorization.

3952243681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 3952243681 is about 62866.8726834730. The cubic root of 3952243681 is about 1581.0583734288.

The spelling of 3952243681 in words is "three billion, nine hundred fifty-two million, two hundred forty-three thousand, six hundred eighty-one".