215257543 has 2 divisors, whose sum is σ = 215257544. Its totient is φ = 215257542.

The previous prime is 215257487. The next prime is 215257561. The reversal of 215257543 is 345752512.

215257543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215257543 - 2²¹ = 213160391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215257499 and 215257508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215257243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107628771 + 107628772.

It is an arithmetic number, because the mean of its divisors is an integer number (107628772).

Almost surely, 2^215257543 is an apocalyptic number.

215257543 is a deficient number, since it is larger than the sum of its proper divisors (1).

215257543 is an equidigital number, since it uses as much as digits as its factorization.

215257543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 34.

The square root of 215257543 is about 14671.6578136215. The cubic root of 215257543 is about 599.3117506380.

It can be divided in two parts, 2152 and 57543, that added together give a palindrome (59695).

The spelling of 215257543 in words is "two hundred fifteen million, two hundred fifty-seven thousand, five hundred forty-three".