77238431 has 2 divisors, whose sum is σ = 77238432. Its totient is φ = 77238430.

The previous prime is 77238419. The next prime is 77238433. The reversal of 77238431 is 13483277.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77238431 - 2⁶ = 77238367 is a prime.

It is a super-2 number, since 2×77238431² = 11931550446683522, which contains 22 as substring.

Together with 77238433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77238391 and 77238400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77238433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38619215 + 38619216.

It is an arithmetic number, because the mean of its divisors is an integer number (38619216).

Almost surely, 2^77238431 is an apocalyptic number.

77238431 is a deficient number, since it is larger than the sum of its proper divisors (1).

77238431 is an equidigital number, since it uses as much as digits as its factorization.

77238431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 77238431 is about 8788.5397535654. The cubic root of 77238431 is about 425.8707517854.

The spelling of 77238431 in words is "seventy-seven million, two hundred thirty-eight thousand, four hundred thirty-one".