77861111 has 2 divisors, whose sum is σ = 77861112. Its totient is φ = 77861110.

The previous prime is 77861101. The next prime is 77861117. The reversal of 77861111 is 11116877.

It is a strong prime.

It is an emirp because it is prime and its reverse (11116877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77861111 - 2²² = 73666807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77861117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38930555 + 38930556.

It is an arithmetic number, because the mean of its divisors is an integer number (38930556).

Almost surely, 2^77861111 is an apocalyptic number.

77861111 is a deficient number, since it is larger than the sum of its proper divisors (1).

77861111 is an equidigital number, since it uses as much as digits as its factorization.

77861111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 32.

The square root of 77861111 is about 8823.8943216700. The cubic root of 77861111 is about 427.0121169460.

Adding to 77861111 its reverse (11116877), we get a palindrome (88977988).

The spelling of 77861111 in words is "seventy-seven million, eight hundred sixty-one thousand, one hundred eleven".