69675821 has 2 divisors, whose sum is σ = 69675822. Its totient is φ = 69675820.

The previous prime is 69675803. The next prime is 69675829. The reversal of 69675821 is 12857696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 136900 = 8339^2 + 370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69675821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69675829) 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, 34837910 + 34837911.

It is an arithmetic number, because the mean of its divisors is an integer number (34837911).

Almost surely, 2^69675821 is an apocalyptic number.

It is an amenable number.

69675821 is a deficient number, since it is larger than the sum of its proper divisors (1).

69675821 is an equidigital number, since it uses as much as digits as its factorization.

69675821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 69675821 is about 8347.2043823067. The cubic root of 69675821 is about 411.4913385910.

The spelling of 69675821 in words is "sixty-nine million, six hundred seventy-five thousand, eight hundred twenty-one".