681091490 has 16 divisors (see below), whose sum is σ = 1226491200. Its totient is φ = 272319600.

The previous prime is 681091471. The next prime is 681091501. The reversal of 681091490 is 94190186.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12161 + ... + 38859.

It is an arithmetic number, because the mean of its divisors is an integer number (76655700).

Almost surely, 2^681091490 is an apocalyptic number.

681091490 is a deficient number, since it is larger than the sum of its proper divisors (545399710).

681091490 is a wasteful number, since it uses less digits than its factorization.

681091490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29257.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 681091490 is about 26097.7295947368. The cubic root of 681091490 is about 879.8361824883.

The spelling of 681091490 in words is "six hundred eighty-one million, ninety-one thousand, four hundred ninety".