11301999781 has 2 divisors, whose sum is σ = 11301999782. Its totient is φ = 11301999780.

The previous prime is 11301999763. The next prime is 11301999811. The reversal of 11301999781 is 18799910311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7601224225 + 3700775556 = 87185^2 + 60834^2 .

It is a cyclic number.

It is not a de Polignac number, because 11301999781 - 2⁵ = 11301999749 is a prime.

It is a super-2 number, since 2×11301999781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11301990781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5650999890 + 5650999891.

It is an arithmetic number, because the mean of its divisors is an integer number (5650999891).

Almost surely, 2^11301999781 is an apocalyptic number.

It is an amenable number.

11301999781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11301999781 is an equidigital number, since it uses as much as digits as its factorization.

11301999781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 49.

The spelling of 11301999781 in words is "eleven billion, three hundred one million, nine hundred ninety-nine thousand, seven hundred eighty-one".