1678961 has 2 divisors, whose sum is σ = 1678962. Its totient is φ = 1678960.

The previous prime is 1678951. The next prime is 1678979. The reversal of 1678961 is 1698761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 1936 = 1295^2 + 44^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678961 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (1678921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839480 + 839481.

It is an arithmetic number, because the mean of its divisors is an integer number (839481).

2^1678961 is an apocalyptic number.

It is an amenable number.

1678961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678961 is an equidigital number, since it uses as much as digits as its factorization.

1678961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 1678961 is about 1295.7472747415. The cubic root of 1678961 is about 118.8539271169.

It can be divided in two parts, 16 and 78961, that multiplied together give a square (1263376 = 1124²).

The spelling of 1678961 in words is "one million, six hundred seventy-eight thousand, nine hundred sixty-one".