219142291 has 4 divisors (see below), whose sum is σ = 232033032. Its totient is φ = 206251552.

The previous prime is 219142267. The next prime is 219142307. The reversal of 219142291 is 192241912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 219142291 - 2²¹ = 217045139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (219142201) 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, 6445345 + ... + 6445378.

It is an arithmetic number, because the mean of its divisors is an integer number (58008258).

Almost surely, 2^219142291 is an apocalyptic number.

219142291 is a deficient number, since it is larger than the sum of its proper divisors (12890741).

219142291 is a wasteful number, since it uses less digits than its factorization.

219142291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890740.

The product of its digits is 2592, while the sum is 31.

The square root of 219142291 is about 14803.4553736619. The cubic root of 219142291 is about 602.8955327094.

The spelling of 219142291 in words is "two hundred nineteen million, one hundred forty-two thousand, two hundred ninety-one".