215542049 has 2 divisors, whose sum is σ = 215542050. Its totient is φ = 215542048.

The previous prime is 215542027. The next prime is 215542073. The reversal of 215542049 is 940245512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202350625 + 13191424 = 14225^2 + 3632^2 .

It is a cyclic number.

It is not a de Polignac number, because 215542049 - 2²⁰ = 214493473 is a prime.

It is not a weakly prime, because it can be changed into another prime (215542079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107771024 + 107771025.

It is an arithmetic number, because the mean of its divisors is an integer number (107771025).

Almost surely, 2^215542049 is an apocalyptic number.

It is an amenable number.

215542049 is a deficient number, since it is larger than the sum of its proper divisors (1).

215542049 is an equidigital number, since it uses as much as digits as its factorization.

215542049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 215542049 is about 14681.3503806700. The cubic root of 215542049 is about 599.5756712756.

The spelling of 215542049 in words is "two hundred fifteen million, five hundred forty-two thousand, forty-nine".