43523881 has 2 divisors, whose sum is σ = 43523882. Its totient is φ = 43523880.

The previous prime is 43523849. The next prime is 43523891. The reversal of 43523881 is 18832534.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38192400 + 5331481 = 6180^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 43523881 - 2⁵ = 43523849 is a prime.

It is a super-2 number, since 2×43523881² = 3788656434604322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43523891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21761940 + 21761941.

It is an arithmetic number, because the mean of its divisors is an integer number (21761941).

Almost surely, 2^43523881 is an apocalyptic number.

It is an amenable number.

43523881 is a deficient number, since it is larger than the sum of its proper divisors (1).

43523881 is an equidigital number, since it uses as much as digits as its factorization.

43523881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 43523881 is about 6597.2631446684. The cubic root of 43523881 is about 351.7568294030.

The spelling of 43523881 in words is "forty-three million, five hundred twenty-three thousand, eight hundred eighty-one".