215391746849 has 2 divisors, whose sum is σ = 215391746850. Its totient is φ = 215391746848.

The previous prime is 215391746839. The next prime is 215391746891. The reversal of 215391746849 is 948647193512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187656175249 + 27735571600 = 433193^2 + 166540^2 .

It is a cyclic number.

It is not a de Polignac number, because 215391746849 - 2⁴ = 215391746833 is a prime.

It is a super-2 number, since 2×215391746849² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215391746809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107695873424 + 107695873425.

It is an arithmetic number, because the mean of its divisors is an integer number (107695873425).

Almost surely, 2^215391746849 is an apocalyptic number.

It is an amenable number.

215391746849 is a deficient number, since it is larger than the sum of its proper divisors (1).

215391746849 is an equidigital number, since it uses as much as digits as its factorization.

215391746849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 59.

The spelling of 215391746849 in words is "two hundred fifteen billion, three hundred ninety-one million, seven hundred forty-six thousand, eight hundred forty-nine".