215481349 has 2 divisors, whose sum is σ = 215481350. Its totient is φ = 215481348.

The previous prime is 215481311. The next prime is 215481359. The reversal of 215481349 is 943184512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183196225 + 32285124 = 13535^2 + 5682^2 .

It is a cyclic number.

It is not a de Polignac number, because 215481349 - 2⁷ = 215481221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215481359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107740674 + 107740675.

It is an arithmetic number, because the mean of its divisors is an integer number (107740675).

Almost surely, 2^215481349 is an apocalyptic number.

It is an amenable number.

215481349 is a deficient number, since it is larger than the sum of its proper divisors (1).

215481349 is an equidigital number, since it uses as much as digits as its factorization.

215481349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 215481349 is about 14679.2829865767. The cubic root of 215481349 is about 599.5193827071.

The spelling of 215481349 in words is "two hundred fifteen million, four hundred eighty-one thousand, three hundred forty-nine".