2157771241 has 4 divisors (see below), whose sum is σ = 2161076292. Its totient is φ = 2154466192.

The previous prime is 2157771199. The next prime is 2157771281. The reversal of 2157771241 is 1421777512.

2157771241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 317018025 + 1840753216 = 17805^2 + 42904^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157771241 - 2⁹ = 2157770729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157771241.

It is not an unprimeable number, because it can be changed into a prime (2157771281) 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, 1651546 + ... + 1652851.

It is an arithmetic number, because the mean of its divisors is an integer number (540269073).

Almost surely, 2^2157771241 is an apocalyptic number.

It is an amenable number.

2157771241 is a deficient number, since it is larger than the sum of its proper divisors (3305051).

2157771241 is an equidigital number, since it uses as much as digits as its factorization.

2157771241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305050.

The product of its digits is 27440, while the sum is 37.

The square root of 2157771241 is about 46451.8163369313. The cubic root of 2157771241 is about 1292.2160577066.

The spelling of 2157771241 in words is "two billion, one hundred fifty-seven million, seven hundred seventy-one thousand, two hundred forty-one".