43521473 has 2 divisors, whose sum is σ = 43521474. Its totient is φ = 43521472.

The previous prime is 43521469. The next prime is 43521521. The reversal of 43521473 is 37412534.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43467649 + 53824 = 6593^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 43521473 - 2² = 43521469 is a prime.

It is a super-2 number, since 2×43521473² = 3788237224179458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43521403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21760736 + 21760737.

It is an arithmetic number, because the mean of its divisors is an integer number (21760737).

Almost surely, 2^43521473 is an apocalyptic number.

It is an amenable number.

43521473 is a deficient number, since it is larger than the sum of its proper divisors (1).

43521473 is an equidigital number, since it uses as much as digits as its factorization.

43521473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 29.

The square root of 43521473 is about 6597.0806422235. The cubic root of 43521473 is about 351.7503421900.

The spelling of 43521473 in words is "forty-three million, five hundred twenty-one thousand, four hundred seventy-three".