691600901 has 2 divisors, whose sum is σ = 691600902. Its totient is φ = 691600900.

The previous prime is 691600879. The next prime is 691600907. The reversal of 691600901 is 109006196.

It is a happy number.

691600901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669463876 + 22137025 = 25874^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 691600901 - 2⁶ = 691600837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691600907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345800450 + 345800451.

It is an arithmetic number, because the mean of its divisors is an integer number (345800451).

Almost surely, 2^691600901 is an apocalyptic number.

It is an amenable number.

691600901 is a deficient number, since it is larger than the sum of its proper divisors (1).

691600901 is an equidigital number, since it uses as much as digits as its factorization.

691600901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 691600901 is about 26298.3060481089. The cubic root of 691600901 is about 884.3384678288.

The spelling of 691600901 in words is "six hundred ninety-one million, six hundred thousand, nine hundred one".