2157841773 has 24 divisors (see below), whose sum is σ = 3414036600. Its totient is φ = 1307249664.

The previous prime is 2157841753. The next prime is 2157841789. The reversal of 2157841773 is 3771487512.

2157841773 is a `hidden beast` number, since 2 + 1 + 578 + 4 + 1 + 7 + 73 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 564395049 + 1593446724 = 23757^2 + 39918^2 .

It is not a de Polignac number, because 2157841773 - 2⁹ = 2157841261 is a prime.

It is a super-2 number, since 2×2157841773² = 9312562234607567058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157841733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238728 + ... + 247601.

It is an arithmetic number, because the mean of its divisors is an integer number (142251525).

Almost surely, 2^2157841773 is an apocalyptic number.

It is an amenable number.

2157841773 is a deficient number, since it is larger than the sum of its proper divisors (1256194827).

2157841773 is a wasteful number, since it uses less digits than its factorization.

2157841773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486381 (or 486378 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 2157841773 is about 46452.5755260136. The cubic root of 2157841773 is about 1292.2301372945.

The spelling of 2157841773 in words is "two billion, one hundred fifty-seven million, eight hundred forty-one thousand, seven hundred seventy-three".