1678259249 has 2 divisors, whose sum is σ = 1678259250. Its totient is φ = 1678259248.

The previous prime is 1678259213. The next prime is 1678259279. The reversal of 1678259249 is 9429528761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1513599025 + 164660224 = 38905^2 + 12832^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678259249 - 2⁸ = 1678258993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1678259249.

It is not a weakly prime, because it can be changed into another prime (1678259279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839129624 + 839129625.

It is an arithmetic number, because the mean of its divisors is an integer number (839129625).

Almost surely, 2^1678259249 is an apocalyptic number.

It is an amenable number.

1678259249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678259249 is an equidigital number, since it uses as much as digits as its factorization.

1678259249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 1678259249 is about 40966.5625724200. The cubic root of 1678259249 is about 1188.3736578612.

The spelling of 1678259249 in words is "one billion, six hundred seventy-eight million, two hundred fifty-nine thousand, two hundred forty-nine".