2157730361 has 2 divisors, whose sum is σ = 2157730362. Its totient is φ = 2157730360.

The previous prime is 2157730313. The next prime is 2157730403. The reversal of 2157730361 is 1630377512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1735222336 + 422508025 = 41656^2 + 20555^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157730361 - 2¹⁸ = 2157468217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157730301) 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, 1078865180 + 1078865181.

It is an arithmetic number, because the mean of its divisors is an integer number (1078865181).

Almost surely, 2^2157730361 is an apocalyptic number.

It is an amenable number.

2157730361 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157730361 is an equidigital number, since it uses as much as digits as its factorization.

2157730361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 2157730361 is about 46451.3763089965. The cubic root of 2157730361 is about 1292.2078971063.

The spelling of 2157730361 in words is "two billion, one hundred fifty-seven million, seven hundred thirty thousand, three hundred sixty-one".