1980467521 has 2 divisors, whose sum is σ = 1980467522. Its totient is φ = 1980467520.

The previous prime is 1980467501. The next prime is 1980467537. The reversal of 1980467521 is 1257640891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1740558400 + 239909121 = 41720^2 + 15489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1980467521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980467501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990233760 + 990233761.

It is an arithmetic number, because the mean of its divisors is an integer number (990233761).

Almost surely, 2^1980467521 is an apocalyptic number.

It is an amenable number.

1980467521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980467521 is an equidigital number, since it uses as much as digits as its factorization.

1980467521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1980467521 is about 44502.4439890665. The cubic root of 1980467521 is about 1255.8060611156.

The spelling of 1980467521 in words is "one billion, nine hundred eighty million, four hundred sixty-seven thousand, five hundred twenty-one".