681161528 has 16 divisors (see below), whose sum is σ = 1282908480. Its totient is φ = 339052608.

The previous prime is 681161521. The next prime is 681161567. The reversal of 681161528 is 825161186.

It is a junction number, because it is equal to n+sod(n) for n = 681161491 and 681161500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681161521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189125 + ... + 192692.

It is an arithmetic number, because the mean of its divisors is an integer number (80181780).

Almost surely, 2^681161528 is an apocalyptic number.

It is an amenable number.

681161528 is a deficient number, since it is larger than the sum of its proper divisors (601746952).

681161528 is a wasteful number, since it uses less digits than its factorization.

681161528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382046 (or 382042 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 681161528 is about 26099.0714011054. The cubic root of 681161528 is about 879.8663398927.

The spelling of 681161528 in words is "six hundred eighty-one million, one hundred sixty-one thousand, five hundred twenty-eight".