2133494681 has 2 divisors, whose sum is σ = 2133494682. Its totient is φ = 2133494680.

The previous prime is 2133494677. The next prime is 2133494749. The reversal of 2133494681 is 1864943312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1245454681 + 888040000 = 35291^2 + 29800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2133494681 - 2² = 2133494677 is a prime.

It is a super-2 number, since 2×2133494681² = 9103599107710583522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2133494281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1066747340 + 1066747341.

It is an arithmetic number, because the mean of its divisors is an integer number (1066747341).

Almost surely, 2^2133494681 is an apocalyptic number.

It is an amenable number.

2133494681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2133494681 is an equidigital number, since it uses as much as digits as its factorization.

2133494681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 2133494681 is about 46189.7681418732. The cubic root of 2133494681 is about 1287.3516327101.

The spelling of 2133494681 in words is "two billion, one hundred thirty-three million, four hundred ninety-four thousand, six hundred eighty-one".