69750721 has 2 divisors, whose sum is σ = 69750722. Its totient is φ = 69750720.

The previous prime is 69750689. The next prime is 69750739. The reversal of 69750721 is 12705796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50566321 + 19184400 = 7111^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 69750721 - 2⁵ = 69750689 is a prime.

It is not a weakly prime, because it can be changed into another prime (69750761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34875360 + 34875361.

It is an arithmetic number, because the mean of its divisors is an integer number (34875361).

Almost surely, 2^69750721 is an apocalyptic number.

It is an amenable number.

69750721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69750721 is an equidigital number, since it uses as much as digits as its factorization.

69750721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 69750721 is about 8351.6897092744. The cubic root of 69750721 is about 411.6387338832.

The spelling of 69750721 in words is "sixty-nine million, seven hundred fifty thousand, seven hundred twenty-one".