219540949 has 2 divisors, whose sum is σ = 219540950. Its totient is φ = 219540948.

The previous prime is 219540931. The next prime is 219540961. The reversal of 219540949 is 949045912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207878724 + 11662225 = 14418^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 219540949 - 2⁵ = 219540917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219540749) 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, 109770474 + 109770475.

It is an arithmetic number, because the mean of its divisors is an integer number (109770475).

Almost surely, 2^219540949 is an apocalyptic number.

It is an amenable number.

219540949 is a deficient number, since it is larger than the sum of its proper divisors (1).

219540949 is an equidigital number, since it uses as much as digits as its factorization.

219540949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 219540949 is about 14816.9142873947. The cubic root of 219540949 is about 603.2609019065.

The spelling of 219540949 in words is "two hundred nineteen million, five hundred forty thousand, nine hundred forty-nine".