2157788273 has 2 divisors, whose sum is σ = 2157788274. Its totient is φ = 2157788272.

The previous prime is 2157788233. The next prime is 2157788299. The reversal of 2157788273 is 3728877512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1589776384 + 568011889 = 39872^2 + 23833^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157788273 - 2⁶ = 2157788209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157788233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078894136 + 1078894137.

It is an arithmetic number, because the mean of its divisors is an integer number (1078894137).

Almost surely, 2^2157788273 is an apocalyptic number.

It is an amenable number.

2157788273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157788273 is an equidigital number, since it uses as much as digits as its factorization.

2157788273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 50.

The square root of 2157788273 is about 46451.9996663222. Note that the first 3 decimals coincide. The cubic root of 2157788273 is about 1292.2194576601.

The spelling of 2157788273 in words is "two billion, one hundred fifty-seven million, seven hundred eighty-eight thousand, two hundred seventy-three".