43063787381 has 4 divisors (see below), whose sum is σ = 43127775852. Its totient is φ = 42999798912.

The previous prime is 43063787353. The next prime is 43063787441. The reversal of 43063787381 is 18378736034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18378736034 = 2 ⋅9189368017.

It can be written as a sum of positive squares in 2 ways, for example, as 6416811025 + 36646976356 = 80105^2 + 191434^2 .

It is a cyclic number.

It is not a de Polignac number, because 43063787381 - 2²² = 43059593077 is a prime.

It is a super-2 number, since 2×43063787381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43063787341) 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, 31993226 + ... + 31994571.

It is an arithmetic number, because the mean of its divisors is an integer number (10781943963).

Almost surely, 2^43063787381 is an apocalyptic number.

It is an amenable number.

43063787381 is a deficient number, since it is larger than the sum of its proper divisors (63988471).

43063787381 is an equidigital number, since it uses as much as digits as its factorization.

43063787381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63988470.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 43063787381 in words is "forty-three billion, sixty-three million, seven hundred eighty-seven thousand, three hundred eighty-one".