1990520613 has 12 divisors (see below), whose sum is σ = 2901575820. Its totient is φ = 1314838656.

The previous prime is 1990520593. The next prime is 1990520627. The reversal of 1990520613 is 3160250991.

1990520613 is a `hidden beast` number, since 19 + 9 + 0 + 5 + 20 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1422270369 + 568250244 = 37713^2 + 23838^2 .

It is not a de Polignac number, because 1990520613 - 2⁶ = 1990520549 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990520113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1013556 + ... + 1015517.

It is an arithmetic number, because the mean of its divisors is an integer number (241797985).

Almost surely, 2^1990520613 is an apocalyptic number.

It is an amenable number.

1990520613 is a deficient number, since it is larger than the sum of its proper divisors (911055207).

1990520613 is a wasteful number, since it uses less digits than its factorization.

1990520613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029188 (or 2029185 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 1990520613 is about 44615.2509014575. The cubic root of 1990520613 is about 1257.9273501906.

The spelling of 1990520613 in words is "one billion, nine hundred ninety million, five hundred twenty thousand, six hundred thirteen".