219142991 has 16 divisors (see below), whose sum is σ = 230646528. Its totient is φ = 208017600.

The previous prime is 219142961. The next prime is 219143003. The reversal of 219142991 is 199241912.

It is not a de Polignac number, because 219142991 - 2²² = 214948687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219142901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241160 + ... + 242066.

It is an arithmetic number, because the mean of its divisors is an integer number (14415408).

Almost surely, 2^219142991 is an apocalyptic number.

219142991 is a deficient number, since it is larger than the sum of its proper divisors (11503537).

219142991 is an equidigital number, since it uses as much as digits as its factorization.

219142991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its digits is 11664, while the sum is 38.

The square root of 219142991 is about 14803.4790167717. The cubic root of 219142991 is about 602.8961746461.

The spelling of 219142991 in words is "two hundred nineteen million, one hundred forty-two thousand, nine hundred ninety-one".