2135231281 has 2 divisors, whose sum is σ = 2135231282. Its totient is φ = 2135231280.

The previous prime is 2135231269. The next prime is 2135231309. The reversal of 2135231281 is 1821325312.

It is an a-pointer prime, because the next prime (2135231309) can be obtained adding 2135231281 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2057438881 + 77792400 = 45359^2 + 8820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135231281 - 2⁵ = 2135231249 is a prime.

It is a super-2 number, since 2×2135231281² = 9118425246721801922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2135231081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067615640 + 1067615641.

It is an arithmetic number, because the mean of its divisors is an integer number (1067615641).

Almost surely, 2^2135231281 is an apocalyptic number.

It is an amenable number.

2135231281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135231281 is an equidigital number, since it uses as much as digits as its factorization.

2135231281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 2135231281 is about 46208.5628536530. The cubic root of 2135231281 is about 1287.7008263851.

Adding to 2135231281 its reverse (1821325312), we get a palindrome (3956556593).

The spelling of 2135231281 in words is "two billion, one hundred thirty-five million, two hundred thirty-one thousand, two hundred eighty-one".