215456641 has 2 divisors, whose sum is σ = 215456642. Its totient is φ = 215456640.

The previous prime is 215456611. The next prime is 215456669. The reversal of 215456641 is 146654512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116553616 + 98903025 = 10796^2 + 9945^2 .

It is a cyclic number.

It is not a de Polignac number, because 215456641 - 2⁵ = 215456609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215456597 and 215456606.

It is not a weakly prime, because it can be changed into another prime (215456611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107728320 + 107728321.

It is an arithmetic number, because the mean of its divisors is an integer number (107728321).

Almost surely, 2^215456641 is an apocalyptic number.

It is an amenable number.

215456641 is a deficient number, since it is larger than the sum of its proper divisors (1).

215456641 is an equidigital number, since it uses as much as digits as its factorization.

215456641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 215456641 is about 14678.4413682107. The cubic root of 215456641 is about 599.4964673578.

The spelling of 215456641 in words is "two hundred fifteen million, four hundred fifty-six thousand, six hundred forty-one".