3986902561 has 2 divisors, whose sum is σ = 3986902562. Its totient is φ = 3986902560.

The previous prime is 3986902489. The next prime is 3986902573. The reversal of 3986902561 is 1652096893.

3986902561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3040971025 + 945931536 = 55145^2 + 30756^2 .

It is a cyclic number.

It is not a de Polignac number, because 3986902561 - 2²⁷ = 3852684833 is a prime.

It is not a weakly prime, because it can be changed into another prime (3986903561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993451280 + 1993451281.

It is an arithmetic number, because the mean of its divisors is an integer number (1993451281).

Almost surely, 2^3986902561 is an apocalyptic number.

It is an amenable number.

3986902561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3986902561 is an equidigital number, since it uses as much as digits as its factorization.

3986902561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 3986902561 is about 63141.9239570668. The cubic root of 3986902561 is about 1585.6665834599. Note that the first 3 decimals are identical.

The spelling of 3986902561 in words is "three billion, nine hundred eighty-six million, nine hundred two thousand, five hundred sixty-one".