209610628901 has 2 divisors, whose sum is σ = 209610628902. Its totient is φ = 209610628900.

The previous prime is 209610628873. The next prime is 209610628919. The reversal of 209610628901 is 109826016902.

209610628901 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., 204259706401 + 5350922500 = 451951^2 + 73150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209610628901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209610622901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104805314450 + 104805314451.

It is an arithmetic number, because the mean of its divisors is an integer number (104805314451).

Almost surely, 2^209610628901 is an apocalyptic number.

It is an amenable number.

209610628901 is a deficient number, since it is larger than the sum of its proper divisors (1).

209610628901 is an equidigital number, since it uses as much as digits as its factorization.

209610628901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 209610628901 in words is "two hundred nine billion, six hundred ten million, six hundred twenty-eight thousand, nine hundred one".