43261304786981 has 4 divisors (see below), whose sum is σ = 43261947199500. Its totient is φ = 43260662374464.

The previous prime is 43261304786969. The next prime is 43261304787031. The reversal of 43261304786981 is 18968740316234.

It is a happy number.

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 1801433730625 + 41459871056356 = 1342175^2 + 6438934^2 .

It is a cyclic number.

It is not a de Polignac number, because 43261304786981 - 2¹⁴ = 43261304770597 is a prime.

It is a super-4 number, since 4×43261304786981⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43261304786951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321105236 + ... + 321239933.

It is an arithmetic number, because the mean of its divisors is an integer number (10815486799875).

Almost surely, 2^{43261304786981} is an apocalyptic number.

It is an amenable number.

43261304786981 is a deficient number, since it is larger than the sum of its proper divisors (642412519).

43261304786981 is an equidigital number, since it uses as much as digits as its factorization.

43261304786981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642412518.

The product of its (nonzero) digits is 41803776, while the sum is 62.

The spelling of 43261304786981 in words is "forty-three trillion, two hundred sixty-one billion, three hundred four million, seven hundred eighty-six thousand, nine hundred eighty-one".