11215817797 has 2 divisors, whose sum is σ = 11215817798. Its totient is φ = 11215817796.

The previous prime is 11215817791. The next prime is 11215817827. The reversal of 11215817797 is 79771851211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8860268641 + 2355549156 = 94129^2 + 48534^2 .

It is a cyclic number.

It is not a de Polignac number, because 11215817797 - 2¹⁵ = 11215785029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11215817797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11215817791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5607908898 + 5607908899.

It is an arithmetic number, because the mean of its divisors is an integer number (5607908899).

Almost surely, 2^11215817797 is an apocalyptic number.

It is an amenable number.

11215817797 is a deficient number, since it is larger than the sum of its proper divisors (1).

11215817797 is an equidigital number, since it uses as much as digits as its factorization.

11215817797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 49.

The spelling of 11215817797 in words is "eleven billion, two hundred fifteen million, eight hundred seventeen thousand, seven hundred ninety-seven".