1980516971 has 2 divisors, whose sum is σ = 1980516972. Its totient is φ = 1980516970.

The previous prime is 1980516953. The next prime is 1980517087. The reversal of 1980516971 is 1796150891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1980516971 - 2⁶ = 1980516907 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980513971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990258485 + 990258486.

It is an arithmetic number, because the mean of its divisors is an integer number (990258486).

Almost surely, 2^1980516971 is an apocalyptic number.

1980516971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980516971 is an equidigital number, since it uses as much as digits as its factorization.

1980516971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1980516971 is about 44502.9995730625. Note that the first 3 decimals coincide. The cubic root of 1980516971 is about 1255.8165130404.

The spelling of 1980516971 in words is "one billion, nine hundred eighty million, five hundred sixteen thousand, nine hundred seventy-one".