1939085521 has 2 divisors, whose sum is σ = 1939085522. Its totient is φ = 1939085520.

The previous prime is 1939085509. The next prime is 1939085579. The reversal of 1939085521 is 1255809391.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1913187600 + 25897921 = 43740^2 + 5089^2 .

It is an emirp because it is prime and its reverse (1255809391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1939085521 - 2²⁷ = 1804867793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939085021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969542760 + 969542761.

It is an arithmetic number, because the mean of its divisors is an integer number (969542761).

Almost surely, 2^1939085521 is an apocalyptic number.

It is an amenable number.

1939085521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939085521 is an equidigital number, since it uses as much as digits as its factorization.

1939085521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1939085521 is about 44035.0487793530. The cubic root of 1939085521 is about 1246.9977059040.

The spelling of 1939085521 in words is "one billion, nine hundred thirty-nine million, eighty-five thousand, five hundred twenty-one".