681406145 has 16 divisors (see below), whose sum is σ = 935212800. Its totient is φ = 466893504.

The previous prime is 681406109. The next prime is 681406151. The reversal of 681406145 is 541604186.

681406145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681406145 - 2⁶ = 681406081 is a prime.

It is a super-2 number, since 2×681406145² = 928628668887522050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44156 + ... + 57554.

It is an arithmetic number, because the mean of its divisors is an integer number (58450800).

Almost surely, 2^681406145 is an apocalyptic number.

It is an amenable number.

681406145 is a deficient number, since it is larger than the sum of its proper divisors (253806655).

681406145 is a wasteful number, since it uses less digits than its factorization.

681406145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14864.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 681406145 is about 26103.7572966039. The cubic root of 681406145 is about 879.9716524098.

The spelling of 681406145 in words is "six hundred eighty-one million, four hundred six thousand, one hundred forty-five".