69001721 has 2 divisors, whose sum is σ = 69001722. Its totient is φ = 69001720.

The previous prime is 69001693. The next prime is 69001733. The reversal of 69001721 is 12710096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54834025 + 14167696 = 7405^2 + 3764^2 .

It is a cyclic number.

It is not a de Polignac number, because 69001721 - 2¹⁰ = 69000697 is a prime.

It is a super-2 number, since 2×69001721² = 9522475001923682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (69001741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34500860 + 34500861.

It is an arithmetic number, because the mean of its divisors is an integer number (34500861).

Almost surely, 2^69001721 is an apocalyptic number.

It is an amenable number.

69001721 is a deficient number, since it is larger than the sum of its proper divisors (1).

69001721 is an equidigital number, since it uses as much as digits as its factorization.

69001721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 69001721 is about 8306.7274542987. The cubic root of 69001721 is about 410.1600029878.

The spelling of 69001721 in words is "sixty-nine million, one thousand, seven hundred twenty-one".