1783272521 has 2 divisors, whose sum is σ = 1783272522. Its totient is φ = 1783272520.

The previous prime is 1783272509. The next prime is 1783272523. The reversal of 1783272521 is 1252723871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1492740496 + 290532025 = 38636^2 + 17045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1783272521 is a prime.

Together with 1783272523, 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 (1783272523) 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, 891636260 + 891636261.

It is an arithmetic number, because the mean of its divisors is an integer number (891636261).

Almost surely, 2^1783272521 is an apocalyptic number.

It is an amenable number.

1783272521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1783272521 is an equidigital number, since it uses as much as digits as its factorization.

1783272521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 1783272521 is about 42228.8115035221. The cubic root of 1783272521 is about 1212.6605212922.

The spelling of 1783272521 in words is "one billion, seven hundred eighty-three million, two hundred seventy-two thousand, five hundred twenty-one".