215556041 has 2 divisors, whose sum is σ = 215556042. Its totient is φ = 215556040.

The previous prime is 215556017. The next prime is 215556049. The reversal of 215556041 is 140655512.

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., 209815225 + 5740816 = 14485^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 215556041 - 2²⁶ = 148447177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215555995 and 215556013.

It is not a weakly prime, because it can be changed into another prime (215556049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107778020 + 107778021.

It is an arithmetic number, because the mean of its divisors is an integer number (107778021).

Almost surely, 2^215556041 is an apocalyptic number.

It is an amenable number.

215556041 is a deficient number, since it is larger than the sum of its proper divisors (1).

215556041 is an equidigital number, since it uses as much as digits as its factorization.

215556041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 215556041 is about 14681.8268958601. The cubic root of 215556041 is about 599.5886448946.

The spelling of 215556041 in words is "two hundred fifteen million, five hundred fifty-six thousand, forty-one".