19793957481 has 27 divisors (see below), whose sum is σ = 29903084029. Its totient is φ = 12616043352.

The previous prime is 19793957471. The next prime is 19793957483. The reversal of 19793957481 is 18475939791.

The square root of 19793957481 is 140691.

It is a perfect power (a square), and thus also a powerful number.

19793957481 is a `hidden beast` number, since 1 + 9 + 79 + 39 + 57 + 481 = 666.

It is not a de Polignac number, because 19793957481 - 2⁹ = 19793956969 is a prime.

It is a super-2 number, since 2×19793957481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19793957483) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9706660 + ... + 9708698.

Almost surely, 2^19793957481 is an apocalyptic number.

19793957481 is the 140691-st square number.

19793957481 is the 70346-th centered octagonal number.

It is an amenable number.

19793957481 is a deficient number, since it is larger than the sum of its proper divisors (10109126548).

19793957481 is an frugal number, since it uses more digits than its factorization.

19793957481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 2065 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

The spelling of 19793957481 in words is "nineteen billion, seven hundred ninety-three million, nine hundred fifty-seven thousand, four hundred eighty-one".