681465421 has 16 divisors (see below), whose sum is σ = 839664000. Its totient is φ = 538579008.

The previous prime is 681465409. The next prime is 681465443. The reversal of 681465421 is 124564186.

681465421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681465421 - 2²¹ = 679368269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681465401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89055 + ... + 96403.

It is an arithmetic number, because the mean of its divisors is an integer number (52479000).

Almost surely, 2^681465421 is an apocalyptic number.

It is an amenable number.

681465421 is a deficient number, since it is larger than the sum of its proper divisors (158198579).

681465421 is a wasteful number, since it uses less digits than its factorization.

681465421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388.

The product of its digits is 46080, while the sum is 37.

The square root of 681465421 is about 26104.8926640199. The cubic root of 681465421 is about 879.9971681211.

The spelling of 681465421 in words is "six hundred eighty-one million, four hundred sixty-five thousand, four hundred twenty-one".