219472391 has 2 divisors, whose sum is σ = 219472392. Its totient is φ = 219472390.

The previous prime is 219472361. The next prime is 219472399. The reversal of 219472391 is 193274912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 219472391 - 2¹⁴ = 219456007 is a prime.

It is a super-2 number, since 2×219472391² = 96336260822513762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219472399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109736195 + 109736196.

It is an arithmetic number, because the mean of its divisors is an integer number (109736196).

Almost surely, 2^219472391 is an apocalyptic number.

219472391 is a deficient number, since it is larger than the sum of its proper divisors (1).

219472391 is an equidigital number, since it uses as much as digits as its factorization.

219472391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 219472391 is about 14814.6006021087. The cubic root of 219472391 is about 603.1981001574.

The spelling of 219472391 in words is "two hundred nineteen million, four hundred seventy-two thousand, three hundred ninety-one".