69819989 has 2 divisors, whose sum is σ = 69819990. Its totient is φ = 69819988.

The previous prime is 69819931. The next prime is 69820013. The reversal of 69819989 is 98991896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44488900 + 25331089 = 6670^2 + 5033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69819989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69819389) 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, 34909994 + 34909995.

It is an arithmetic number, because the mean of its divisors is an integer number (34909995).

Almost surely, 2^69819989 is an apocalyptic number.

It is an amenable number.

69819989 is a deficient number, since it is larger than the sum of its proper divisors (1).

69819989 is an equidigital number, since it uses as much as digits as its factorization.

69819989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 59.

The square root of 69819989 is about 8355.8356254776. The cubic root of 69819989 is about 411.7749521088.

The spelling of 69819989 in words is "sixty-nine million, eight hundred nineteen thousand, nine hundred eighty-nine".