40851281689 has 9 divisors (see below), whose sum is σ = 41038282453. Its totient is φ = 40665131932.

The previous prime is 40851281657. The next prime is 40851281693. The reversal of 40851281689 is 98618215804.

It is a happy number.

The square root of 40851281689 is 202117.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 40851281689 - 2⁵ = 40851281657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40851281629) 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 8 ways as a sum of consecutive naturals, for example, 72559722 + ... + 72560284.

Almost surely, 2^40851281689 is an apocalyptic number.

40851281689 is the 202117-th square number.

40851281689 is the 101059-th centered octagonal number.

It is an amenable number.

40851281689 is a deficient number, since it is larger than the sum of its proper divisors (187000764).

40851281689 is an frugal number, since it uses more digits than its factorization.

40851281689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 40851281689 in words is "forty billion, eight hundred fifty-one million, two hundred eighty-one thousand, six hundred eighty-nine".