1980472721 has 2 divisors, whose sum is σ = 1980472722. Its totient is φ = 1980472720.

The previous prime is 1980472667. The next prime is 1980472723. The reversal of 1980472721 is 1272740891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311526225 + 668946496 = 36215^2 + 25864^2 .

It is an emirp because it is prime and its reverse (1272740891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1980472721 - 2²² = 1976278417 is a prime.

Together with 1980472723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1980472723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990236360 + 990236361.

It is an arithmetic number, because the mean of its divisors is an integer number (990236361).

Almost surely, 2^1980472721 is an apocalyptic number.

It is an amenable number.

1980472721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980472721 is an equidigital number, since it uses as much as digits as its factorization.

1980472721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1980472721 is about 44502.5024127857. The cubic root of 1980472721 is about 1255.8071602140.

The spelling of 1980472721 in words is "one billion, nine hundred eighty million, four hundred seventy-two thousand, seven hundred twenty-one".