219935381 has 2 divisors, whose sum is σ = 219935382. Its totient is φ = 219935380.

The previous prime is 219935377. The next prime is 219935383. The reversal of 219935381 is 183539912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150062500 + 69872881 = 12250^2 + 8359^2 .

It is a cyclic number.

It is not a de Polignac number, because 219935381 - 2² = 219935377 is a prime.

It is a super-2 number, since 2×219935381² = 96743143631230322, which contains 22 as substring.

Together with 219935383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219935383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109967690 + 109967691.

It is an arithmetic number, because the mean of its divisors is an integer number (109967691).

Almost surely, 2^219935381 is an apocalyptic number.

It is an amenable number.

219935381 is a deficient number, since it is larger than the sum of its proper divisors (1).

219935381 is an equidigital number, since it uses as much as digits as its factorization.

219935381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 219935381 is about 14830.2185081677. The cubic root of 219935381 is about 603.6219629415.

The spelling of 219935381 in words is "two hundred nineteen million, nine hundred thirty-five thousand, three hundred eighty-one".