1986465121 has 2 divisors, whose sum is σ = 1986465122. Its totient is φ = 1986465120.

The previous prime is 1986465053. The next prime is 1986465133. The reversal of 1986465121 is 1215646891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1898780625 + 87684496 = 43575^2 + 9364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986465121 - 2⁷ = 1986464993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1986465421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993232560 + 993232561.

It is an arithmetic number, because the mean of its divisors is an integer number (993232561).

Almost surely, 2^1986465121 is an apocalyptic number.

It is an amenable number.

1986465121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986465121 is an equidigital number, since it uses as much as digits as its factorization.

1986465121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 1986465121 is about 44569.7781125282. The cubic root of 1986465121 is about 1257.0724678361.

The spelling of 1986465121 in words is "one billion, nine hundred eighty-six million, four hundred sixty-five thousand, one hundred twenty-one".