43115521 has 2 divisors, whose sum is σ = 43115522. Its totient is φ = 43115520.

The previous prime is 43115509. The next prime is 43115533. The reversal of 43115521 is 12551134.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (43115509) and next prime (43115533).

It can be written as a sum of positive squares in only one way, i.e., 36433296 + 6682225 = 6036^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 43115521 - 2⁷ = 43115393 is a prime.

It is a super-2 number, since 2×43115521² = 3717896302202882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43115492 and 43115501.

It is not a weakly prime, because it can be changed into another prime (43115561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21557760 + 21557761.

It is an arithmetic number, because the mean of its divisors is an integer number (21557761).

Almost surely, 2^43115521 is an apocalyptic number.

It is an amenable number.

43115521 is a deficient number, since it is larger than the sum of its proper divisors (1).

43115521 is an equidigital number, since it uses as much as digits as its factorization.

43115521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 43115521 is about 6566.2410098930. The cubic root of 43115521 is about 350.6532588754.

Adding to 43115521 its reverse (12551134), we get a palindrome (55666655).

The spelling of 43115521 in words is "forty-three million, one hundred fifteen thousand, five hundred twenty-one".