2150729981 has 2 divisors, whose sum is σ = 2150729982. Its totient is φ = 2150729980.

The previous prime is 2150729951. The next prime is 2150730013. The reversal of 2150729981 is 1899270512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947809956 + 202920025 = 44134^2 + 14245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2150729981 is a prime.

It is a super-2 number, since 2×2150729981² = 9251278902344520722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2150729951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075364990 + 1075364991.

It is an arithmetic number, because the mean of its divisors is an integer number (1075364991).

Almost surely, 2^2150729981 is an apocalyptic number.

It is an amenable number.

2150729981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2150729981 is an equidigital number, since it uses as much as digits as its factorization.

2150729981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 2150729981 is about 46375.9633970013. The cubic root of 2150729981 is about 1290.8089353672.

The spelling of 2150729981 in words is "two billion, one hundred fifty million, seven hundred twenty-nine thousand, nine hundred eighty-one".