69973721 has 2 divisors, whose sum is σ = 69973722. Its totient is φ = 69973720.

The previous prime is 69973699. The next prime is 69973747. The reversal of 69973721 is 12737996.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35868121 + 34105600 = 5989^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 69973721 - 2¹⁴ = 69957337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (69973121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34986860 + 34986861.

It is an arithmetic number, because the mean of its divisors is an integer number (34986861).

Almost surely, 2^69973721 is an apocalyptic number.

It is an amenable number.

69973721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69973721 is an equidigital number, since it uses as much as digits as its factorization.

69973721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 69973721 is about 8365.0296472876. The cubic root of 69973721 is about 412.0769505465.

The spelling of 69973721 in words is "sixty-nine million, nine hundred seventy-three thousand, seven hundred twenty-one".