43511039261 has 2 divisors, whose sum is σ = 43511039262. Its totient is φ = 43511039260.

The previous prime is 43511039161. The next prime is 43511039263. The reversal of 43511039261 is 16293011534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39048131236 + 4462908025 = 197606^2 + 66805^2 .

It is a cyclic number.

It is not a de Polignac number, because 43511039261 - 2³⁴ = 26331170077 is a prime.

It is a super-2 number, since 2×43511039261² (a number of 22 digits) contains 22 as substring.

Together with 43511039263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43511039263) 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 as a sum of consecutive naturals, namely, 21755519630 + 21755519631.

It is an arithmetic number, because the mean of its divisors is an integer number (21755519631).

Almost surely, 2^43511039261 is an apocalyptic number.

It is an amenable number.

43511039261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43511039261 is an equidigital number, since it uses as much as digits as its factorization.

43511039261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 43511039261 in words is "forty-three billion, five hundred eleven million, thirty-nine thousand, two hundred sixty-one".