681521283 has 10 divisors (see below), whose sum is σ = 1018075124. Its totient is φ = 454347468.

The previous prime is 681521251. The next prime is 681521297. The reversal of 681521283 is 382125186.

It is a happy number.

It is not a de Polignac number, because 681521283 - 2⁵ = 681521251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681521983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4206841 + ... + 4207002.

Almost surely, 2^681521283 is an apocalyptic number.

681521283 is a deficient number, since it is larger than the sum of its proper divisors (336553841).

681521283 is an equidigital number, since it uses as much as digits as its factorization.

681521283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8413855 (or 8413846 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 681521283 is about 26105.9625947790. The cubic root of 681521283 is about 880.0212129012.

The spelling of 681521283 in words is "six hundred eighty-one million, five hundred twenty-one thousand, two hundred eighty-three".