43039236681 has 135 divisors (see below), whose sum is σ = 77739376869. Its totient is φ = 23660284032.

The previous prime is 43039236673. The next prime is 43039236707. The reversal of 43039236681 is 18663293034.

The square root of 43039236681 is 207459.

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

It can be written as a sum of positive squares in 4 ways, for example, as 651015225 + 42388221456 = 25515^2 + 205884^2 .

It is not a de Polignac number, because 43039236681 - 2³ = 43039236673 is a prime.

It is a super-2 number, since 2×43039236681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43039236641) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 483586885 + ... + 483586973.

Almost surely, 2^43039236681 is an apocalyptic number.

43039236681 is the 207459-th square number.

43039236681 is the 103730-th centered octagonal number.

It is an amenable number.

43039236681 is a deficient number, since it is larger than the sum of its proper divisors (34700140188).

43039236681 is an frugal number, since it uses more digits than its factorization.

43039236681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 43039236681 in words is "forty-three billion, thirty-nine million, two hundred thirty-six thousand, six hundred eighty-one".