77942219 has 2 divisors, whose sum is σ = 77942220. Its totient is φ = 77942218.

The previous prime is 77942213. The next prime is 77942233. The reversal of 77942219 is 91224977.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77942219 is a prime.

It is a super-3 number, since 3×77942219³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77942213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38971109 + 38971110.

It is an arithmetic number, because the mean of its divisors is an integer number (38971110).

Almost surely, 2^77942219 is an apocalyptic number.

77942219 is a deficient number, since it is larger than the sum of its proper divisors (1).

77942219 is an equidigital number, since it uses as much as digits as its factorization.

77942219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 77942219 is about 8828.4890553254. The cubic root of 77942219 is about 427.1603384786.

The spelling of 77942219 in words is "seventy-seven million, nine hundred forty-two thousand, two hundred nineteen".