73785431 has 2 divisors, whose sum is σ = 73785432. Its totient is φ = 73785430.

The previous prime is 73785427. The next prime is 73785433. The reversal of 73785431 is 13458737.

It is a strong prime.

It is an emirp because it is prime and its reverse (13458737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73785431 - 2² = 73785427 is a prime.

It is a super-2 number, since 2×73785431² = 10888579655711522, which contains 22 as substring.

Together with 73785433, 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 (73785433) 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, 36892715 + 36892716.

It is an arithmetic number, because the mean of its divisors is an integer number (36892716).

Almost surely, 2^73785431 is an apocalyptic number.

73785431 is a deficient number, since it is larger than the sum of its proper divisors (1).

73785431 is an equidigital number, since it uses as much as digits as its factorization.

73785431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 73785431 is about 8589.8446435311. The cubic root of 73785431 is about 419.4274719848.

It can be divided in two parts, 737 and 85431, that added together give a palindrome (86168).

The spelling of 73785431 in words is "seventy-three million, seven hundred eighty-five thousand, four hundred thirty-one".