219149906 has 4 divisors (see below), whose sum is σ = 328724862. Its totient is φ = 109574952.

The previous prime is 219149891. The next prime is 219149929. The reversal of 219149906 is 609941912.

It is a happy number.

219149906 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 138886225 + 80263681 = 11785^2 + 8959^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54787475 + ... + 54787478.

Almost surely, 2^219149906 is an apocalyptic number.

219149906 is a deficient number, since it is larger than the sum of its proper divisors (109574956).

219149906 is a wasteful number, since it uses less digits than its factorization.

219149906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109574955.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 219149906 is about 14803.7125748915. The cubic root of 219149906 is about 602.9025159899.

The spelling of 219149906 in words is "two hundred nineteen million, one hundred forty-nine thousand, nine hundred six".