1939085513 has 4 divisors (see below), whose sum is σ = 1945202820. Its totient is φ = 1932968208.

The previous prime is 1939085509. The next prime is 1939085521. The reversal of 1939085513 is 3155809391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 578065849 + 1361019664 = 24043^2 + 36892^2 .

It is a cyclic number.

It is not a de Polignac number, because 1939085513 - 2² = 1939085509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939085503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3058178 + ... + 3058811.

It is an arithmetic number, because the mean of its divisors is an integer number (486300705).

Almost surely, 2^1939085513 is an apocalyptic number.

It is an amenable number.

1939085513 is a deficient number, since it is larger than the sum of its proper divisors (6117307).

1939085513 is an equidigital number, since it uses as much as digits as its factorization.

1939085513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6117306.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 1939085513 is about 44035.0486885163. The cubic root of 1939085513 is about 1246.9977041891.

The spelling of 1939085513 in words is "one billion, nine hundred thirty-nine million, eighty-five thousand, five hundred thirteen".