681499545 has 32 divisors (see below), whose sum is σ = 1154829312. Its totient is φ = 342462912.

The previous prime is 681499537. The next prime is 681499547. The reversal of 681499545 is 545994186.

It is not a de Polignac number, because 681499545 - 2³ = 681499537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681499547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8374 + ... + 37856.

It is an arithmetic number, because the mean of its divisors is an integer number (36088416).

Almost surely, 2^681499545 is an apocalyptic number.

It is an amenable number.

681499545 is a deficient number, since it is larger than the sum of its proper divisors (473329767).

681499545 is a wasteful number, since it uses less digits than its factorization.

681499545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29581.

The product of its digits is 1555200, while the sum is 51.

The square root of 681499545 is about 26105.5462497914. The cubic root of 681499545 is about 880.0118563313.

The spelling of 681499545 in words is "six hundred eighty-one million, four hundred ninety-nine thousand, five hundred forty-five".