215444641 has 2 divisors, whose sum is σ = 215444642. Its totient is φ = 215444640.

The previous prime is 215444623. The next prime is 215444651. The reversal of 215444641 is 146444512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192404641 + 23040000 = 13871^2 + 4800^2 .

It is a cyclic number.

It is not a de Polignac number, because 215444641 - 2¹³ = 215436449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215444651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107722320 + 107722321.

It is an arithmetic number, because the mean of its divisors is an integer number (107722321).

Almost surely, 2^215444641 is an apocalyptic number.

It is an amenable number.

215444641 is a deficient number, since it is larger than the sum of its proper divisors (1).

215444641 is an equidigital number, since it uses as much as digits as its factorization.

215444641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 31.

The square root of 215444641 is about 14678.0325997730. The cubic root of 215444641 is about 599.4853373672.

The spelling of 215444641 in words is "two hundred fifteen million, four hundred forty-four thousand, six hundred forty-one".