43215013 has 2 divisors, whose sum is σ = 43215014. Its totient is φ = 43215012.

The previous prime is 43214923. The next prime is 43215019. The reversal of 43215013 is 31051234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42211009 + 1004004 = 6497^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 43215013 - 2¹⁷ = 43083941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43215019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21607506 + 21607507.

It is an arithmetic number, because the mean of its divisors is an integer number (21607507).

Almost surely, 2^43215013 is an apocalyptic number.

It is an amenable number.

43215013 is a deficient number, since it is larger than the sum of its proper divisors (1).

43215013 is an equidigital number, since it uses as much as digits as its factorization.

43215013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 43215013 is about 6573.8126684596. The cubic root of 43215013 is about 350.9227704319.

Adding to 43215013 its reverse (31051234), we get a palindrome (74266247).

The spelling of 43215013 in words is "forty-three million, two hundred fifteen thousand, thirteen".