681471215 has 8 divisors (see below), whose sum is σ = 822783408. Its totient is φ = 541831680.

The previous prime is 681471211. The next prime is 681471221. The reversal of 681471215 is 512174186.

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

It is not a de Polignac number, because 681471215 - 2² = 681471211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681471211) 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, 417266 + ... + 418895.

It is an arithmetic number, because the mean of its divisors is an integer number (102847926).

Almost surely, 2^681471215 is an apocalyptic number.

681471215 is a deficient number, since it is larger than the sum of its proper divisors (141312193).

681471215 is a wasteful number, since it uses less digits than its factorization.

681471215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836329.

The product of its digits is 13440, while the sum is 35.

The square root of 681471215 is about 26105.0036391493. The cubic root of 681471215 is about 879.9996621039. Note that the first 3 decimals are identical.

The spelling of 681471215 in words is "six hundred eighty-one million, four hundred seventy-one thousand, two hundred fifteen".