671742679 has 2 divisors, whose sum is σ = 671742680. Its totient is φ = 671742678.

The previous prime is 671742661. The next prime is 671742697. The reversal of 671742679 is 976247176.

Together with next prime (671742697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (671742661) and next prime (671742697).

It is a cyclic number.

It is not a de Polignac number, because 671742679 - 2¹³ = 671734487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671742649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335871339 + 335871340.

It is an arithmetic number, because the mean of its divisors is an integer number (335871340).

Almost surely, 2^671742679 is an apocalyptic number.

671742679 is a deficient number, since it is larger than the sum of its proper divisors (1).

671742679 is an equidigital number, since it uses as much as digits as its factorization.

671742679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 671742679 is about 25917.9991318774. Note that the first 3 decimals coincide. The cubic root of 671742679 is about 875.7920138786.

The spelling of 671742679 in words is "six hundred seventy-one million, seven hundred forty-two thousand, six hundred seventy-nine".