681505242 has 32 divisors (see below), whose sum is σ = 1490171904. Its totient is φ = 206065200.

The previous prime is 681505211. The next prime is 681505247. The reversal of 681505242 is 242505186.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (681505247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19767 + ... + 41877.

It is an arithmetic number, because the mean of its divisors is an integer number (46567872).

Almost surely, 2^681505242 is an apocalyptic number.

681505242 is an abundant number, since it is smaller than the sum of its proper divisors (808666662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681505242 is a wasteful number, since it uses less digits than its factorization.

681505242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22594.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 681505242 is about 26105.6553643076. The cubic root of 681505242 is about 880.0143084795.

The spelling of 681505242 in words is "six hundred eighty-one million, five hundred five thousand, two hundred forty-two".