67791431 has 2 divisors, whose sum is σ = 67791432. Its totient is φ = 67791430.

The previous prime is 67791391. The next prime is 67791517. The reversal of 67791431 is 13419776.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67791431 is a prime.

It is a super-2 number, since 2×67791431² = 9191356234055522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67790431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33895715 + 33895716.

It is an arithmetic number, because the mean of its divisors is an integer number (33895716).

Almost surely, 2^67791431 is an apocalyptic number.

67791431 is a deficient number, since it is larger than the sum of its proper divisors (1).

67791431 is an equidigital number, since it uses as much as digits as its factorization.

67791431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 67791431 is about 8233.5551859449. Note that the first 3 decimals coincide. The cubic root of 67791431 is about 407.7477755924.

The spelling of 67791431 in words is "sixty-seven million, seven hundred ninety-one thousand, four hundred thirty-one".