245640671 has 2 divisors, whose sum is σ = 245640672. Its totient is φ = 245640670.

The previous prime is 245640641. The next prime is 245640673. The reversal of 245640671 is 176046542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245640671 - 2²² = 241446367 is a prime.

Together with 245640673, 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 (245640673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122820335 + 122820336.

It is an arithmetic number, because the mean of its divisors is an integer number (122820336).

Almost surely, 2^245640671 is an apocalyptic number.

245640671 is a deficient number, since it is larger than the sum of its proper divisors (1).

245640671 is an equidigital number, since it uses as much as digits as its factorization.

245640671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 245640671 is about 15672.9279651251. The cubic root of 245640671 is about 626.2774265647.

The spelling of 245640671 in words is "two hundred forty-five million, six hundred forty thousand, six hundred seventy-one".