77242219 has 2 divisors, whose sum is σ = 77242220. Its totient is φ = 77242218.

The previous prime is 77242183. The next prime is 77242241. The reversal of 77242219 is 91224277.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77242219 - 2¹¹ = 77240171 is a prime.

It is a super-2 number, since 2×77242219² = 11932720792087922, which contains 22 as substring.

It is equal to p_4517917 and since 77242219 and 4517917 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (77242279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38621109 + 38621110.

It is an arithmetic number, because the mean of its divisors is an integer number (38621110).

Almost surely, 2^77242219 is an apocalyptic number.

77242219 is a deficient number, since it is larger than the sum of its proper divisors (1).

77242219 is an equidigital number, since it uses as much as digits as its factorization.

77242219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 77242219 is about 8788.7552588521. The cubic root of 77242219 is about 425.8777136567.

The spelling of 77242219 in words is "seventy-seven million, two hundred forty-two thousand, two hundred nineteen".