678969901 has 2 divisors, whose sum is σ = 678969902. Its totient is φ = 678969900.

The previous prime is 678969859. The next prime is 678969917. The reversal of 678969901 is 109969876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580761801 + 98208100 = 24099^2 + 9910^2 .

It is a cyclic number.

It is not a de Polignac number, because 678969901 - 2¹¹ = 678967853 is a prime.

It is a super-2 number, since 2×678969901² = 922000252927899602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678969931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339484950 + 339484951.

It is an arithmetic number, because the mean of its divisors is an integer number (339484951).

Almost surely, 2^678969901 is an apocalyptic number.

It is an amenable number.

678969901 is a deficient number, since it is larger than the sum of its proper divisors (1).

678969901 is an equidigital number, since it uses as much as digits as its factorization.

678969901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 678969901 is about 26057.0508883872. The cubic root of 678969901 is about 878.9216737668.

The spelling of 678969901 in words is "six hundred seventy-eight million, nine hundred sixty-nine thousand, nine hundred one".