43671523381 has 2 divisors, whose sum is σ = 43671523382. Its totient is φ = 43671523380.

The previous prime is 43671523373. The next prime is 43671523457. The reversal of 43671523381 is 18332517634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27692288100 + 15979235281 = 166410^2 + 126409^2 .

It is a cyclic number.

It is not a de Polignac number, because 43671523381 - 2³ = 43671523373 is a prime.

It is a super-2 number, since 2×43671523381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43671523331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21835761690 + 21835761691.

It is an arithmetic number, because the mean of its divisors is an integer number (21835761691).

Almost surely, 2^43671523381 is an apocalyptic number.

It is an amenable number.

43671523381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43671523381 is an equidigital number, since it uses as much as digits as its factorization.

43671523381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 43.

The spelling of 43671523381 in words is "forty-three billion, six hundred seventy-one million, five hundred twenty-three thousand, three hundred eighty-one".