245654639 has 2 divisors, whose sum is σ = 245654640. Its totient is φ = 245654638.

The previous prime is 245654627. The next prime is 245654653. The reversal of 245654639 is 936456542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245654639 - 2⁴ = 245654623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245654639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245654699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122827319 + 122827320.

It is an arithmetic number, because the mean of its divisors is an integer number (122827320).

Almost surely, 2^245654639 is an apocalyptic number.

245654639 is a deficient number, since it is larger than the sum of its proper divisors (1).

245654639 is an equidigital number, since it uses as much as digits as its factorization.

245654639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 44.

The square root of 245654639 is about 15673.3735679336. The cubic root of 245654639 is about 626.2892971252.

The spelling of 245654639 in words is "two hundred forty-five million, six hundred fifty-four thousand, six hundred thirty-nine".