2137928081 has 4 divisors (see below), whose sum is σ = 2147103972. Its totient is φ = 2128752192.

The previous prime is 2137928077. The next prime is 2137928083. The reversal of 2137928081 is 1808297312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134560000 + 2003368081 = 11600^2 + 44759^2 .

It is a cyclic number.

It is not a de Polignac number, because 2137928081 - 2² = 2137928077 is a prime.

It is a super-2 number, since 2×2137928081² = 9141472959056685122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2137928083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4587596 + ... + 4588061.

It is an arithmetic number, because the mean of its divisors is an integer number (536775993).

Almost surely, 2^2137928081 is an apocalyptic number.

It is an amenable number.

2137928081 is a deficient number, since it is larger than the sum of its proper divisors (9175891).

2137928081 is an equidigital number, since it uses as much as digits as its factorization.

2137928081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175890.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 2137928081 is about 46237.7343843748. The cubic root of 2137928081 is about 1288.2427209406.

The spelling of 2137928081 in words is "two billion, one hundred thirty-seven million, nine hundred twenty-eight thousand, eighty-one".