77998231 has 2 divisors, whose sum is σ = 77998232. Its totient is φ = 77998230.

The previous prime is 77998229. The next prime is 77998241. The reversal of 77998231 is 13289977.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13289977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77998231 - 2¹ = 77998229 is a prime.

It is a super-2 number, since 2×77998231² = 12167448078258722, which contains 22 as substring.

Together with 77998229, 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 (77998241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999115 + 38999116.

It is an arithmetic number, because the mean of its divisors is an integer number (38999116).

Almost surely, 2^77998231 is an apocalyptic number.

77998231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77998231 is an equidigital number, since it uses as much as digits as its factorization.

77998231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 77998231 is about 8831.6607158563. The cubic root of 77998231 is about 427.2626380884.

The spelling of 77998231 in words is "seventy-seven million, nine hundred ninety-eight thousand, two hundred thirty-one".