3989195827961 has 2 divisors, whose sum is σ = 3989195827962. Its totient is φ = 3989195827960.

The previous prime is 3989195827891. The next prime is 3989195827999. The reversal of 3989195827961 is 1697285919893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2455112934400 + 1534082893561 = 1566880^2 + 1238581^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989195827961 - 2¹⁰ = 3989195826937 is a prime.

It is not a weakly prime, because it can be changed into another prime (3989195857961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994597913980 + 1994597913981.

It is an arithmetic number, because the mean of its divisors is an integer number (1994597913981).

Almost surely, 2^{3989195827961} is an apocalyptic number.

It is an amenable number.

3989195827961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989195827961 is an equidigital number, since it uses as much as digits as its factorization.

3989195827961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529079040, while the sum is 77.

The spelling of 3989195827961 in words is "three trillion, nine hundred eighty-nine billion, one hundred ninety-five million, eight hundred twenty-seven thousand, nine hundred sixty-one".