219609157 has 4 divisors (see below), whose sum is σ = 223752780. Its totient is φ = 215465536.

The previous prime is 219609149. The next prime is 219609197. The reversal of 219609157 is 751906912.

219609157 is digitally balanced in base 2, 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 2 ways, for example, as 94303521 + 125305636 = 9711^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 219609157 - 2³ = 219609149 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219609197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071732 + ... + 2071837.

It is an arithmetic number, because the mean of its divisors is an integer number (55938195).

Almost surely, 2^219609157 is an apocalyptic number.

It is an amenable number.

219609157 is a deficient number, since it is larger than the sum of its proper divisors (4143623).

219609157 is an equidigital number, since it uses as much as digits as its factorization.

219609157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4143622.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 219609157 is about 14819.2158024640. The cubic root of 219609157 is about 603.3233700690.

The spelling of 219609157 in words is "two hundred nineteen million, six hundred nine thousand, one hundred fifty-seven".