68982989 has 2 divisors, whose sum is σ = 68982990. Its totient is φ = 68982988.

The previous prime is 68982983. The next prime is 68983021. The reversal of 68982989 is 98928986.

Added to its reverse (98928986) it gives a triangular number (167911975 = T₁₈₃₂₅).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 3648100 = 8083^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 68982989 - 2⁴ = 68982973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68982983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34491494 + 34491495.

It is an arithmetic number, because the mean of its divisors is an integer number (34491495).

Almost surely, 2^68982989 is an apocalyptic number.

It is an amenable number.

68982989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68982989 is an equidigital number, since it uses as much as digits as its factorization.

68982989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 59.

The square root of 68982989 is about 8305.5998579272. The cubic root of 68982989 is about 410.1228840463.

Adding to 68982989 its reverse (98928986), we get a triangular number (167911975 = T₁₈₃₂₅).

The spelling of 68982989 in words is "sixty-eight million, nine hundred eighty-two thousand, nine hundred eighty-nine".