213997919 has 4 divisors (see below), whose sum is σ = 216402480. Its totient is φ = 211593360.

The previous prime is 213997907. The next prime is 213997939. The reversal of 213997919 is 919799312.

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 213997919 - 2¹² = 213993823 is a prime.

It is a super-2 number, since 2×213997919² = 91590218672661122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213997939) 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, 1202147 + ... + 1202324.

It is an arithmetic number, because the mean of its divisors is an integer number (54100620).

Almost surely, 2^213997919 is an apocalyptic number.

213997919 is a deficient number, since it is larger than the sum of its proper divisors (2404561).

213997919 is an equidigital number, since it uses as much as digits as its factorization.

213997919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404560.

The product of its digits is 275562, while the sum is 50.

The square root of 213997919 is about 14628.6677110392. The cubic root of 213997919 is about 598.1404641273.

The spelling of 213997919 in words is "two hundred thirteen million, nine hundred ninety-seven thousand, nine hundred nineteen".