68351989 has 2 divisors, whose sum is σ = 68351990. Its totient is φ = 68351988.

The previous prime is 68351957. The next prime is 68352007. The reversal of 68351989 is 98915386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 30713764 = 6135^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 68351989 - 2⁵ = 68351957 is a prime.

It is a super-2 number, since 2×68351989² = 9343988800512242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68351909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34175994 + 34175995.

It is an arithmetic number, because the mean of its divisors is an integer number (34175995).

Almost surely, 2^68351989 is an apocalyptic number.

It is an amenable number.

68351989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68351989 is an equidigital number, since it uses as much as digits as its factorization.

68351989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 68351989 is about 8267.5261717155. The cubic root of 68351989 is about 408.8685620896.

The spelling of 68351989 in words is "sixty-eight million, three hundred fifty-one thousand, nine hundred eighty-nine".