67977431 has 2 divisors, whose sum is σ = 67977432. Its totient is φ = 67977430.

The previous prime is 67977419. The next prime is 67977433. The reversal of 67977431 is 13477976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67977431 - 2¹⁰ = 67976407 is a prime.

It is a super-2 number, since 2×67977431² = 9241862250719522, which contains 22 as substring.

Together with 67977433, 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 (67977433) 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, 33988715 + 33988716.

It is an arithmetic number, because the mean of its divisors is an integer number (33988716).

Almost surely, 2^67977431 is an apocalyptic number.

67977431 is a deficient number, since it is larger than the sum of its proper divisors (1).

67977431 is an equidigital number, since it uses as much as digits as its factorization.

67977431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 44.

The square root of 67977431 is about 8244.8426910403. The cubic root of 67977431 is about 408.1203488843.

The spelling of 67977431 in words is "sixty-seven million, nine hundred seventy-seven thousand, four hundred thirty-one".