681648529 has 8 divisors (see below), whose sum is σ = 701006400. Its totient is φ = 662531376.

The previous prime is 681648511. The next prime is 681648533. The reversal of 681648529 is 925846186.

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

It is not a de Polignac number, because 681648529 - 2²³ = 673259921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681648229) 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, 54429 + ... + 65770.

It is an arithmetic number, because the mean of its divisors is an integer number (87625800).

Almost surely, 2^681648529 is an apocalyptic number.

It is an amenable number.

681648529 is a deficient number, since it is larger than the sum of its proper divisors (19357871).

681648529 is a wasteful number, since it uses less digits than its factorization.

681648529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120359.

The product of its digits is 829440, while the sum is 49.

The square root of 681648529 is about 26108.3995871061. The cubic root of 681648529 is about 880.0759787188.

The spelling of 681648529 in words is "six hundred eighty-one million, six hundred forty-eight thousand, five hundred twenty-nine".