681563519 has 8 divisors (see below), whose sum is σ = 838847520. Its totient is φ = 539258976.

The previous prime is 681563479. The next prime is 681563527. The reversal of 681563519 is 915365186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681563519 - 2¹² = 681559423 is a prime.

It is a super-2 number, since 2×681563519² = 929057660863326722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681563519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681563579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3744764 + ... + 3744945.

It is an arithmetic number, because the mean of its divisors is an integer number (104855940).

Almost surely, 2^681563519 is an apocalyptic number.

681563519 is a deficient number, since it is larger than the sum of its proper divisors (157284001).

681563519 is a wasteful number, since it uses less digits than its factorization.

681563519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7489729.

The product of its digits is 194400, while the sum is 44.

The square root of 681563519 is about 26106.7715162178. The cubic root of 681563519 is about 880.0393917456.

The spelling of 681563519 in words is "six hundred eighty-one million, five hundred sixty-three thousand, five hundred nineteen".