1947681513 has 12 divisors (see below), whose sum is σ = 2813906368. Its totient is φ = 1298182680.

The previous prime is 1947681497. The next prime is 1947681521. The reversal of 1947681513 is 3151867491.

1947681513 is a `hidden beast` number, since 19 + 47 + 6 + 81 + 513 = 666.

It is not a de Polignac number, because 1947681513 - 2⁴ = 1947681497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1947681613) 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, 28956 + ... + 68802.

Almost surely, 2^1947681513 is an apocalyptic number.

It is an amenable number.

1947681513 is a deficient number, since it is larger than the sum of its proper divisors (866224855).

1947681513 is a wasteful number, since it uses less digits than its factorization.

1947681513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45284 (or 45281 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 1947681513 is about 44132.5448280518. The cubic root of 1947681513 is about 1248.8376422479.

The spelling of 1947681513 in words is "one billion, nine hundred forty-seven million, six hundred eighty-one thousand, five hundred thirteen".