43998158261 has 4 divisors (see below), whose sum is σ = 44003894124. Its totient is φ = 43992422400.

The previous prime is 43998158249. The next prime is 43998158291. The reversal of 43998158261 is 16285189934.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19654357636 + 24343800625 = 140194^2 + 156025^2 .

It is a cyclic number.

It is not a de Polignac number, because 43998158261 - 2¹⁴ = 43998141877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43998158197 and 43998158206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43998158291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2856410 + ... + 2871771.

It is an arithmetic number, because the mean of its divisors is an integer number (11000973531).

Almost surely, 2^43998158261 is an apocalyptic number.

It is an amenable number.

43998158261 is a deficient number, since it is larger than the sum of its proper divisors (5735863).

43998158261 is an equidigital number, since it uses as much as digits as its factorization.

43998158261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5735862.

The product of its digits is 3732480, while the sum is 56.

The spelling of 43998158261 in words is "forty-three billion, nine hundred ninety-eight million, one hundred fifty-eight thousand, two hundred sixty-one".