291638910653 has 2 divisors, whose sum is σ = 291638910654. Its totient is φ = 291638910652.

The previous prime is 291638910617. The next prime is 291638910671. The reversal of 291638910653 is 356019836192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287685267769 + 3953642884 = 536363^2 + 62878^2 .

It is a cyclic number.

It is not a de Polignac number, because 291638910653 - 2¹⁴ = 291638894269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 291638910595 and 291638910604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291638910253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145819455326 + 145819455327.

It is an arithmetic number, because the mean of its divisors is an integer number (145819455327).

Almost surely, 2^291638910653 is an apocalyptic number.

It is an amenable number.

291638910653 is a deficient number, since it is larger than the sum of its proper divisors (1).

291638910653 is an equidigital number, since it uses as much as digits as its factorization.

291638910653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 291638910653 in words is "two hundred ninety-one billion, six hundred thirty-eight million, nine hundred ten thousand, six hundred fifty-three".