1678012901 has 2 divisors, whose sum is σ = 1678012902. Its totient is φ = 1678012900.

The previous prime is 1678012891. The next prime is 1678012927. The reversal of 1678012901 is 1092108761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1239110401 + 438902500 = 35201^2 + 20950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678012901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678012961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839006450 + 839006451.

It is an arithmetic number, because the mean of its divisors is an integer number (839006451).

Almost surely, 2^1678012901 is an apocalyptic number.

It is an amenable number.

1678012901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678012901 is an equidigital number, since it uses as much as digits as its factorization.

1678012901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 1678012901 is about 40963.5557660709. Note that the first 3 decimals coincide. The cubic root of 1678012901 is about 1188.3155087603.

The spelling of 1678012901 in words is "one billion, six hundred seventy-eight million, twelve thousand, nine hundred one".