11333101981 has 2 divisors, whose sum is σ = 11333101982. Its totient is φ = 11333101980.

The previous prime is 11333101937. The next prime is 11333102111. The reversal of 11333101981 is 18910133311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11319896025 + 13205956 = 106395^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 11333101981 - 2⁷ = 11333101853 is a prime.

It is a super-2 number, since 2×11333101981² (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 (11333101181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5666550990 + 5666550991.

It is an arithmetic number, because the mean of its divisors is an integer number (5666550991).

Almost surely, 2^11333101981 is an apocalyptic number.

It is an amenable number.

11333101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11333101981 is an equidigital number, since it uses as much as digits as its factorization.

11333101981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 11333101981 in words is "eleven billion, three hundred thirty-three million, one hundred one thousand, nine hundred eighty-one".